Really starting to regret starting these collections. I only have Dodgers, Rockies, Yankees, Astros, and Angels left. But I wish I could go back and uncollect every other card or at least quicksell them. With the prices skyrocketing recently there is no chance I complete them now.
Also with all of the new cards and prestiges you can unlock later in the game I don't see the collections being worth millions. Just a small self-pity rant