Haven't posted on here for a while so I apologize if there is already a thread about this, but I recently got back into collecting/re-selling various sports cards. The current prices are insane (over $700 for a box of 2019-20 basketball cards). My question is do you think this is sustainable? From my own personal experience there's a lot of value of buying the boxes without opening them and reselling them at a later time.
I am being told that taking part in this is killing the hobby, but from a financial perspective the returns have been astronomical. Even the process of buying a cheap raw card on ebay for a couple of bucks, getting it graded, and then re-selling provides a consistent average of at least a 100% return on total investment. Has anybody else been getting into this?