Trust me, you don't need shill bidders to crush GPA records at the major auction houses. I'm just one of many sellers able to do it for the past ten years now. I think that certain genres of scarce and sought after material are still selling well. I just went through selling 71 Marvel early bronze age ultra high grade books at auction in March (not via Heritage), and the results once again exceeded expectations based on GPA and other market sources. With everyone at home with little to do, auctions are getting a lot of attention and eyeballs these days.
I was speaking to the propensity of some being unscrupulous and not how to achieve record numbers. I have had offers of people wanting to bid my auctions up for me. I've always said only bid what you're willing to pay and I've even stated numerous times on here how my auctions seemed to take their time to build in any site while comparable books reach a large percentage of fair market value early on.
But I agree that if you have poor products no amount of shill bidding will set records.
As I said earlier, some people are buying furiously right now.