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davidcyclebackeBay will nickle and dime you to death. Using the BIN involves a $$ charge to the seller. Every BIN, every extra picture, every picture enlargement, every minimum bid price increment, every 10 day auction, every subtitle and every PayPal payment costs the seller extra. An eBay seller can have $20+ in charges from eBay & PayPal on an an auction. An eBay can rack up a $2.50 charge for a $5 sale, or $5 for a lot that doesn't get a bid. The sellers won't pay for an extra fuction unless they think it's worth the cost (will show up in final price or in sale vs. no sale). If the sellers aren't using BINs, it's because they don't think it's worth the cost-- in other words, they don't think bidders will BIN often enough to justify the cost.
As a seller, I would use the BIN if I thought it would make me more money. I would put BINs on all my auction right now. The fact that I don't have a BIN on any of my auctions, says I don't view it as a method to make more money.
I think what a lot of buyers only don't realize is that with all the costs (paypal, eBay, shipping, internet cost, snipers trying to get the lowest price possible, etc ,etc), the margins of profit can be razor thin selling on eBay. If a seller choses every useless bell and whistle eBay offers, their razor thin profit will change to loss.