Yes, and you also play for fun.
The best tier lists are created using data from hundreds and hundreds battles determining the best characters. Yes, they will change as new strategies are discovered, but that doesn't mean you should always ignore the current tier list. Especially if you want to win a match.
There are players who play characters that are low tiered and do very well, but they're the exception, not the rule. They practice their "bad" character rigorously and are exception at the game. If you try to play a low-tier character you don't know well or you aren't skilled and you go up against a serious player who uses a superior character, you will lose.
Of course, this advice may have no value to you, since you play "for fun".