You should check the terms and conditions of membership. There may be language in the contract regarding venue and choice of law (i.e., you may have to sue in Washington State), or, worse yet, there may be language making it non-transferrable. In that case, you would have bought something that had no value, and your claim in that case would be against the guy who sold it to you. Good luck finding "zaxxon6969" again.

I should have known that with you, Alex, it couldn't be something so straightforward as you bought a membership from your local gym.