I'd have to speculate that the amount they might raise the bid by for a truck or 2 here and there isnt worth loosing the multi zillion dollar contract that they have with Uncle Sam....
Honestly, I think it's moron bidders who get in over their heads/first time bidders. Look at all the stupid questions we get here like "how do I turn on the windshield wipers" and other such moronic questions that can easily be answered by READING..
Do you think those kind of people actaully read the GL "rules" as to the additional 10% buyers premium, sales tax, EUC, SF-97, etc???
What I think happens is a buyer bids on 5 trucks, when he only wants one, thinking he will get outbid. Turns out he doesnt, and now owns 5 trucks, and cant pay for them all... So he gets the one he wants, defaults on the rest.. I think thats whats going on.
Case and point.. An active member ON THIS SITE, whos name you would all know if I posted it, calls me up a while ago after a big auction, asks me if I want to buy X item.. "why's that?" I ask... "Because I accidentally bid on several of them, and won them all. I figured I'd get outbid, but I didnt" So now he owned 5 items, when he only wanted one. Luckiliy, he did the right thing, managed to pay for them all, (and they were several thousands of dollars EACH) and everything turned out OK... However, I think that many guys do the same thing he did, but dont have the coin to back up the bids when they win way more than they wanted.....
There are ALOT of people that inspect GOVT contracts to make sure the contractors are doing things by the book. GL knows this, and I dont think they are going to risk losing a HUGE contract over a few hundred dollars...