You need to throw in that different styles of batteries respond differently to ageing as well as cycling. Plus several short minimal cycles can do damage to some batteries as well as applying too high of a load in a short period. Applying an extra high load to too small of a battery for a short period of time can do damage even if it preforms its task. Heat is another issue. So yeah, there are several factors to consider.
For the most part we all deal with AGM batteries now days but there are some out there using wet cell types and those have different rules to follow. I suggest at least reading this site for information. It covers quite a bit:
http://www.solar-electric.com/deep-cycl ... y-faq.html