I have bought dozens of bows (and sold almost as many) on here. Just because the bow is a "standard model", that doesn't really tell me what it looks like. When I read "gorgeous waterfall grain", or "spectacular cocobolo" that really doesn't tell me what the bow looks like and looks are definitely part of my selection criteria. One man's "spectacular" might be "middle of the road" to me. Or, even if the grain is fancy, it might be lighter or darker than another similar bow that I'm looking at.
It is definitely a buyers market now and part of the selling process is making your product more attractive than the competing item. I have yet to walk onto a used car lot, look at one car and say "I'll take it".
Especially now that Trad Gang has automatic re-sizing capability for pics, it's not that difficult to post pics with the ad. Post one time instead of e-mailing a dozen times. Faster, easier, and the tire kickers get their thrill and don't bother you with requests for pics.
If it's a used Indian 35# bow for $50 that's one thing. If it's a custom $500 - $1000 bow, your ad has a lot of competition to overcome.