I’ve been having this war with myself for a long time…
My first purchase was a 1:29 GP-9 and a 1:22.5ish box car (Lionel) followed by a 1:29 caboose.
Then I discovered Delton Classics and went nuts buying 1:24
Along the way I purchased more 1:29 diesels, a few 1:22.5 steamers and a 1:24 steamer.
Then I saw the a Bachman Dizzy on sale and bought a fleet. Then came a Connie so now I have lots of 1:20.3 as well.
I think Ric has the right idea - call your scale 1:21.4 (plus as many decimals as you like) and have a Rum-ski, or a bheer and enjoy it.
Oh - I could easily work on 1:1 stuff, there are several local groups plus the FEBT. I’m too busy modeling for that
JR