If you wanna be judgemental about how one spends their money, start from Lilith and the price she decides to put on a hero. If he wants to spend even more than that, it's his privilege after all. He may be even a millionaire or something. Who are we to point the finger?
No hero, ever, since the release of the game was worth this kind of money. In fact we can argue that in the beginning the conjuring stone heroes were worth much less than they are now. Even when the heroes are good, they most certainly are not proportional to how much you spend on them, if they were they would be RIDICULOUSLY good and it would be impossible to play for anyone who did not own them. My advice, stay away from spending these kind of money on heroes, it's meant for rich people who have nothing better to do with the money.