"...I doubt that anyone uses Google to find and buy wall art..."
Jim,
Go to Google and type in wall art. Numerous wall art for sale/sites sites show up almost immediately.
Personally, I like seeing the bots in my visitors stats. At least I know the images are being looked at in some form or fashion. If I received zero visitors, now that might be depressing, lol.
You can get pretty much the same search results using Bing also, but i don't know if they use bots. Probably do though.