Because that is my usual bet price for BTC/ETH price prediction. I can afford to lose this amount and so even I lose the bet I won't be worried.
Betting more than you can afford to lose and then losing the bet gets you stressed, which I don't want. It's meant to be a fun event.
Everybody decides for himself what his bet amount; similar like you I only place small bets anymore. It needs to be fun and even by betting a small amount, it gives something extra when you follow a sportsmatch also. Didn't place any bets this month on the BTC/ETH price prediction allthough the volatility seems a bit lower these days.