Ha! So someone must have paid 50 BTC to change their username in the past years? Mehn I thought that Pizza guy will be the first man to regret spending BTC back then for pennies, we really need to start keeping crypto as a real asset, just because they are cheap today doesn't stop tomorrow from happening.
No one paid 50 BTC just to be able to change their name on the forum, it was only about the members donating that amount to the forum - and from that donation, some additional benefits for such members of the forum obviously resulted. Your problem (and most others') is that you don't consider Bitcoin a currency, which is its primary function, and people who once paid 50 BTC or 10 000 BTC were obviously not in it all just for profit.
If in 10 years 1 BTC will be worth xx times more, does it make sense to pay anything with it today, or will we also be classified as unreasonable people because we didn't know how to save what is valuable?