I see this issue broken into a few pieces: (1) do you have to tell your future SO everything? (2) is this the sort of thing that if you did it you'd feel you have to tell your SO? (3) if it is, is that a reason not to do it?
To my way of thinking the answers are: (1) no, not necessarily, but different people feel differently about this. Carly Simon once did a song called "No Secrets" (title song on the album that featured "You're so Vain"). The song was about exactly this issue.
(2) this is a somewhat different issue - would you feel that this specific thing is something you'd be obligated to tell? I don't think you have any way to know that right now. You don't know how you'll feel about it in the future, you don't know what sort of person or who your future SO will be or how he'll react, you don't know whether it'll turn out to be the sort of thing you really can keep secret anyway. This one is unknowable.
(3) This one is the key issue. If you think doing this would put a serious kink in your future ability to live with yourself or to have a healthy relationship, it's simply not worth it -- certainly not for a few bucks. As the other people have pointed out, money is replaceable. You can't buy your way out of regrets, bad memories or adverse experiences -- all you can do is assimilate them and move on. But your question assumes that you won't find it easy to move on. So then why put yourself in the situation where you have something that it's best to move on from?
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