You sure do know a lot about the lifestyle of a person with a net worth of 660 million dollars. Do you have such a net worth? Is your net worth even above 5 million?
5% of 660 million dollars would be 33 million, that's still a lot of money.
You also have to remember that the guy in question (James Park) collected cards as a kid..
“I lived in Boston for 10 years and so am a huge fan of Brady. The last Super Bowl win was just a mind-blowing accomplishment," Park,
who is a known collector, said via a PWCC Instagram post. "
I’ve also had a love of collecting cards since I was a kid. Given Brady’s uncontested status as GOAT in football, this card is an important piece of sports history and of any collection and I’m incredibly excited to now own 1 of only 100 of Brady’s best rookie card.”
Source:
https://www.usatoday.com/story/sport...rk/4590861001/
Sure, values are important but the guy has the money to acquire grail cards for his PC without risking his financial fortune. He's no different than you and I, he just has a lot more money to play with. From a ratio standpoint, he probably spends as much (maybe even less) than most BO members (money on cards

ersonal net worth).