I build (well, buy) in the scales I build/buy because they are the scales that have the subjects I like. I started w/ 1/32nd snap kits as a kid, migrated to 1/25th then 1/24th, later got into 1/20th (primarily w/ F1 race car kits, though I have a few MPC and Lindbergs of that scale). I've also dabbled in 1/43rd scale kits--a great scale as I also have a lot of diecast in that scale. I have a few 1/16th, 1/12th, and 1/8th scale kits, but never really went deep into the larger scales.