Variety. It'll take me years, but I plan on trying to get ahold of as many Beckers as I can.
Gotta have a chopper for having fun in the woods, a medium one for EDC and any tasks that the chopper may be a bit too large for, and a small one for really easy EDC and really fine tasks.
Thing is, there are quite a few good choppers, one day you might be in a BK9 mood, one day you might want a Machax, maybe you're trying to save space? BK2, BK10, or BK7 is what you'll be grabbing. Of course, the 2, 10, or 7 aren't the greatest at any one specific thing, but they are smaller than the 9 or 'Chax, and that matters to a lot of people.
There are 3 different tweeners (and a couple full sizes that may be considered "medium.") Of course just like the full sizes, each one is somewhat similar, but they all perform a bit differently, maybe you want the 15's blade length and choil, maybe you're trying to just take one knife and the 16 is what you pick since it's so practical, maybe you pick a BK10 for the full size handle, want something a bit smaller than the 10 but similar? Snatch a BK17.
Then there are the smalls, they all have the same blade shape (the 13 is a bit smaller, but same blade shape), but again, each is different. Want something tiny? The 13. Gonna have some root beer? Take the 11. Want an 11 with no bottle opener and a more comfy handle? 14. Want a 14 with (semi)stainless (D2) steel? Get a 24.
Hope that long winded rant helped.
