There are two kinds of Etsy shoppers, I think. The first just use Etsy as a clearinghouse for whatever; they want party favors or wedding invitations or a last-minute gift at the lowest possible price in addition to the warm fuzzies of "handmade" or just the prestige of something unique you can't just buy in a store.
The other are more selective but get really caught up in a shop's passion and expertise. The more information and description in the listing, the better (as long as you put all of your SEO terms at the beginning so they can find you!). The two people who are going to buy your TOTALLY ADORABLE spiders are:
1) people who know about and love spiders and who will want to know everything about the process
2) people who know people who love spiders; the paying customer might not want to know EVERYTHING but the person they're buying for will, so it's good to have your process somewhere where everyone can see it (IMO)
Since most of my jewelry is based on numbers, I wrote up an explanatory page at my blog (instead of retyping or copying and pasting for every number-related listing). It's by far the most-visited page there, so I assume that comes from people following the link when they land on an item in my shop. If you find yourself repeating the same information a lot, you might want to do the same (just to save you time).