The number 22,000 means nothing without specifics on which sets are represented. Not saying $400 is a great deal for what you have, but there's nothing else to go on; and your collection on TCDB shows only a couple of cards.
I purchased 15,000 hockey cards that included 1984-1992 Topps, Pro Set, etc. for $10 from a local card shop.
Follow my blog - I Identify as a Card Collector.
“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis