No, that's totally fine! Soroka is a great player all around, so I'm sure that the card is pretty good. How many PP do you have? A diamond player on a good day can go for 5,000 PP on auctions.
Did you buy OOTP 20 and not play PT? Or did you just not buy the game?
Also I listen to OOTP Now and they said that some big changes are coming to PT tonight, and I'm excited for that.