For me it wasn't a question of brand loyalty, it was simply the fact the Commodore produced the best & most innovative machines for their time... 
Way back end of 81 start of 82 what were the main choices a ZX80/81 which was nothing more than a big calculator or the VIC20 with full size keyboard, slightly better graphics & far superior sound... no brainer that one... 
I've considered a Commodore tattoo, but Franko is more entitled to one than I. I didn't get my first Commodore until at least '86 or '87!
...one day I'll pin down the exact date..