That's very true, but at least for me, being an amateur makes the repetitive practice sessions much less boring, and even more importantly, much less stressful, than they would be if I was (still trying to be) a professional. If I hear a song/piece/solo/part that I want to play, I practice it till I get it right because I love it and being able to play it correctly would make me happy. As a professional, you wouldn't (always) have that, you would feel pressured to get it right so you can collect your paycheck at the end of the day.

I guess it all comes down to mindset, but I don't tend to _excessively_ push myself when I'm just playing for myself. Yes, that probably means I'm not reaching my full potential, ability-wise, but it also means that I can continue to enjoy playing and making music.