Well, there are collectors, accumulators, users, and hoarders.

Collectors usually purchase custom/handmade knives from a few makers. Many of them range in the $1,000s of dollars range.
Accumulators usually buy knives (production, midtech, and some custom), and use some, not others.
Hoarders are folks that buy a bunch of knives, usually production level and relegate them to non use and only handle them or "playing".
Users mostly carry and use their knives, many if not all.
These are my general definitions, some may agree or not.