I guess one of the mistakes many watch enthusiasts makes is that they dont wear their current watches enough before getting another watch. Guilty of this myself too lol
Nothing wrong with wanting more choice and hankering after more, unless you overextend yourself somehow or affect your life in some way.
Hobby is a hobby, just keep it under control and it's all cool.
I've tried to keep it under 10, failed miserably, and keeping it successfully under 20 nowadays. Of course, 1/4 of that is cheap pieces (below $150 or so) so that's how I justify it to myself.