That's a very loaded question. It all depends on what you're selling. And the other factors to look at are:
What's the going rate for that item (check completed listings, then current)?
Do most of these run for 3,5,7,or 10 day or are more sold from a BIN?
Looking at current auctions, are there more on bidding...more on BIN...or with bidding & BIN together?
Another option is to just do the bidding, but have a reserve price set for it.
OH...I'm sorry Tricia! I didn't even realize you were talking about a weird/bizarre auction! <smacking myself in da head> DUH!!
I just sell regular, everyday stuff...so what I talked about before referred to that!
If it's a weird/bizarre auction, that's a different story! I usually don't see a BIN on weird stuff. And as far as a reserve, I usually only see a reserve on mystery auctions. Otherwise...some put on a reserve to make sure they get their listing fees covered if they spend the $$$ to feature it & stuff.
I never used BIN on Bizarre stuff...like my mystery auctions....I used reserve or started the bidding high.......sometimes I would just start it out at the ebay fees too since most times it cost me like 22.00 to list a auction!