I LOVE IT when newbies pull the old "I let you have that one, so remember me on the next one Bull!" What next one? Ain't nobody owe you any respect! You didn't "let" anyone win a unit, you quit bidding! LOL! Anyway, you might not even be around for the NEXT one.
Don't know how large your auction crowd is, but around here, if the door goes up on an exceptional unit, there is NOOO WAAAY a newbie is going to win it. The 'DAWGS' will run ALL the money out of it before a newbie wins! Better bring your check book and credit cards and car title if you think you are going to win an obvious "jackpot" unit only a week on the scene.
Sounds like you are already treasure hunting, that's cool if that's what you want to do. Just know and I will jump off from what Movieman said about most units being bad. I will say most units aren't bad, but bread & butter, work-a-day, ho-hum, flea market vendor units. 90% of the regulars work these units just so every once and a while they can hit a "jackpot" unit. Understand these guys who have been doing it for 10-15 hours a day, 6-7 days a week, over many years are not going to let you walk up with a wad of cash and grab a great unit, no matter how high you bid.
Good Luck!