I went to the one in AC and had a blast. I saw the trimmed Wagner, held a Ruth bat, got interviewed by Topps. My kids participated in breaks, got a bunch of free stuff and were going crazy searching/buying out the .10 boxes by the boatload. Agree, some are there to sell and recover their expenses, others are to showcase their inventory. All in all, great time and well worth the admission, especially if your collector. Hopefully, I'll be there too. I heard the net54 dinner was really cool and maybe I'll be able to make it to one. Good Luck, temper your expectations and you will be very surprised.
{Leon, If I can't post other boards feel free to delete this line and everything below}
Below is a really good thread/topic on the blowout boards. Posted every year from April thru August. It contains a lot of info, dealer stories, etc and is a really good read/look through.
https://www.blowoutforums.com/forumdisplay.php?f=104