Sometimes he brokers, sometimes he just buys the collection, just like reg-lar folks do. The secret is listing every week, clear no-bs pics and honest grading. Something that seems to be lost on about 90% of the Euros on eBay who think everything is "ex, clean!" when it's clouded with ring wear or sounds like sub-space interference. The deal is too many Euros are terrified of listing something VG+, which just means a standard used record without a serious flaw.
I have happily purchased several items from him from the Greg Shaw RIP collection dump, although the garage comps he recently unloaded went for crazy money and I was forced to listen to records I already owned, just tragic.