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I already had some collection stats in a database.
2 1/6
1 1/9
2 1/12
1 1/16
26 1/18
1 1/20
1 1/23
1 1/38
3 1/43
4 1/48
3 1/55
5 1/60
2 1/72
1 1/80
4 1/100
2 1/106
2 1/112
1 1/130
12 1/144
1 1/183
7 1/270
1 1/250
2 1/450
So first place is 1/18th scale (mostly classic GI Joes)
Second goes to 1/144th scale (Gundam stuff and a Galoob TIE fighter)
With 1/270th scale (pic related) in third. (Mecha-Godzilla, Ultraman, King Joe, some Gundam and some super robots)
The rest is non-scale or indeterminate.