Are you more likely to get a good deal on...

[grundle20]

I think it's pretty easy to statistically prove that you will generally get better deals via auction than BIN. Of course there are exceptions to the rule. But simply sign into EBay, look for an item you want, and then scroll down the left hand side until you see "Completed Auctions" and look at that item price as sold via auction over the past couple of weeks vs. what that same item is being asked for on BIN.

Literally, well over 80-85% of the time (in my estimation, but easily calculable) you're going to see auctions going for less money than BIN.

[DixieBaseball]

Are you more likely to get a good deal on...

The answer for me is it depends. I think right now certain types are a little weaker than others, so auction listings are favorable for me, but there is nothing like the BIN for a good deal and being first to grab it! (Bumped into this one yesterday on Feebay and grabbed it with both hands:

1910 T210 OLD MILL TEXAS LEAGUE JOHNSTON SGC 50 4 VG/EX

[alanu]

In my experience I would say there are more "good" deals to be had via auctions, but there is the ocassional "great" deal to be had on BIN's, if you happen to be browsing soon after they are listed.