mtgox was bigger too. There are other reasons for a crypto winter like high interest rates and a newly credible us central bank.
Rest of the world is not bigger when it comes to non residential real estate: private equity, venture, tech, finance.
Europe is usually CardMarket. In the US TCGPlayer seems the most popular with CardKingdom behind them. I've used both TCGPlayer and CardKingdom on the buy side without issues, but you can also list cards for sale (no idea what the process is like).
If you want to get maximum value in exchange for doing more legwork and probably assuming more risk, Ebay or Facebook groups.
