Is it an attempted scam? Are they trying to play me?

[bull]

I just "sold" my T/A-AAR radiator on Ebay yesterday with a BIN of $470 after it did not meet the reserve during a prior auction where the bidding stopped at $400. All my auctions have explicit instructions saying that the "Winning bidder must contact seller via e-mail within 24 hours of auction end with shipping confirmation." It's been more than 24 hours now with no word from the winner and I noticed something interesting about the last auction I conducted. There was just one other bid and the guy who placed it for $350 is the same one who placed the final $400 bid in the first auction. So now I'm wondering if the BIN bidder (muscle2188) and the $350 bidder (cuda71_sg) are in cahoots with each other hoping I'll do a second chance offer for $350 to cuda71_sg if I never hear from muscle2188. Is this a common practice? I've never heard of it but it seems very plausible. At any rate, I'm not biting.

[70charger_boy]

It is common practice for people to have 2 screen names.  One is used to buy products and the other is used to sell products.  Alot of times people would hit the buy it now, just to ruin your auction because they are selling a similar product and this is their way of getting rid of the competition.  I've had people, mostly Canadiens, bid on my products and then they don't pay 
It definately sounds like the guy is waiting for you to send him a second chance offer

[BMOTOXSTAR]

E-Bay is hard to figure out.
I have allmost 700 transactions on ER-Bay and have only been scammed a handful of times. It does sound shady to me.