I've been playing (modestly...) drums, guitar, bass, keys... for the last half a century (well, a bit more, actually...). I've always done so because I like it, and it interests me. I've played in bands, either pro, semi-pro, amateur or just mates, on and off over all that time. Now retired, I still play, and always will. 'Playing out' is fine, but, for me, it's not my sole reason for playing. Essentially, it's just because that's what I do. It matters little whether anyone hears it or not. Does a tree falling in a remote forest make a sound..?