Vitruvius on the Properly Situated Villa Library

Marcus Vitruvius Pollio (80-15 BCE) was a Roman architect and military engineer that lived during the fall of the Roman Republic and the beginning of the imperial era. He is best known for his work "On Architecture" which influenced many great writers and thinkers over the centuries. Vitruvius dedicated Book 6 of this work to the topic of planning a Roman Villa. In one section he discussed the importance of orienting certain rooms towards the sunlight.

"I shall now describe how the different sorts of buildings are placed as regards their aspects. Winter triclinia and baths are to face the winter west, because the afternoon light is wanted in them; and not less so because the setting sun casts its rays upon them, and but its heat warms the aspect towards the evening hours. Bed chambers and libraries should be towards the east, for their purposes require the morning light: in libraries the books are in this aspect preserved from decay; those that are towards the south and west are injured by the worm and by the damp, which the moist winds generate and nourish, and spreading the damp, make the books mouldy." (De Arch., 6.4.1)

It is notable that Vitruvius includes a "library" with all the rooms that make up an ideal Roman Villa. 
The other interesting facet are the effects that solar heat, moisture, and airflow have upon the proper storage and preservation of the books. He indicates that libraries that face away from the morning sun (to the south and west) are in danger of becoming worm eaten and moldy, and decayed with moisture.
Though this is a passing statement by Vitruvius, I gather that it reflects an observed (and perhaps calculated) reality of the preservation and decay of books. Even when stored within a personal library (thus the owner would have vested interest its maintenance and preservation) books could still be subjected to decay and damage. This is not unlike the comments made by Galen that some of books he encountered in the Roman libraries were often in an almost unusable state due to decay and moisture (Peri Alupias 19)
These factors affected the longevity and useful life of books, even when stored within a personal library.
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Vitruvius, De Architectura. (Joseph Gwilt, translator. London: Priestley and Weale, 1826).

Quintilian on Writing Well and Quickly

Ivory relief from the cover of a sacramentary, 10th century, Kunsthistorisches Museum in Vienna

While reading through Raffaella Cribiore's excellent work "Writing, Teachers, and Students in Graeco-Roman Egypt" I came across an interesting reference by Quintilian (ca. 35-100 CE) on the necessity of writing legibly. In his magnum opus, "The Institutes of Oratory" Quintilian was writing on the the art of educating and transforming a young boy into a rhetorician worthy of the Roman courts. In book one Quintilian writes about the necessity of teaching to write legibly.

"The art of writing well and quickly is not unimportant for our purpose, though it is generally disregarded by persons of quality. Writing is of the utmost importance in the study which we have under consideration and by its means alone can true and deeply rooted proficiency be obtained. But a sluggish pen delays our thoughts, while an unformed and illiterate hand cannot be deciphered, a circumstance which necessitates another wearisome task, namely the dictation of what we have written to a copyist. We shall therefore at all times and in all places, and above all when we are writing private letters to our friends, find a gratification in the thought that we have not neglected even this accomplishment." (Inst. Or. 1.1.28-29; )

There are a few elements of Quintilian's comments that relate to New Testament letter writing, in particular, Paul's use of a secretary to write his letters (see discussion here). It is fascinating that Quintilian makes the point that "writing well and quickly" is actually "disregarded by persons of quality"! Thus, the ability to write well was not a marker of high social status.
Despite this, Quintilian emphasizes the importance of clear writing, especially in personal letters, but not at the expense of an inordinate amount of time to write out one's thoughts. He notes especially that one may write out a letter in a less-than-legible hand, but then this eligibility requires the extra step of dictating this out to a copyist for better clarity in writing. Perhaps this is the case with Paul, for example, with regard to his letter to the Romans. He might have written it out himself and then, due to poor handwriting, dictated it out to Tertius (Rom. 16:22) for a more clear and practice hand. Of course this is pure speculation, but this possibility may be added to the list of reasons as to why the authors of the New Testament writings used secretaries and copyists. Also, their inability to write legibly would not have been a marker of low social status. 
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Cribiore, Raffaella "Writing, Teachers, and Students in Graeco-Roman Egypt" (Atlanta: Scholar's Press, 1996).

Quintilian, "Institutes of Oratory," (Harold Edgeworth Butler, trans. Cambridge: Harvard University Press, 1922).