some guys collect several of one brand, or several of one size/class, or a collection of a mix. Some wont select anything after a certain date or before a certain date.
I reckon 10 of anything is a good collection but others will say 3 of one make is too many.
Beauty is in the eye of the beholder as they say so each to their own.
Sounds like you have an obsession.
Good for you.