it was already beyond cost price, it's just super-inflated like so many other records and he is not a retailer. it all depends on how you look at it. if you are a businessman and that's your field, then it's a little different.
it all goes on in the world... rich gimps at old furniture auctions, picking up gems and selling on on for mega profits... and people buying so many homes and selling them so much higher and the knock on effect is clear.
it's done now. your conscience bears witness to it, if you feel guilt, then there is normally a good reason. if not, then chances are, don't worry about it.