In theory, yes, there is a limit.
In practice, we won't live long enough to see it!

I was talking about knives in mixed company, someone asks how many knives do you own. I reply, truthfully, that I don't know exactly, because I've never counted them. Then I state that I probably have more knives than they have pairs of shoes. Most of the guys say, big deal, dress shoes, knock around shoes, basketball shoes, pair of boots, 5 knives isn't that many. Most of the women, who admit to having several shades of many of the colors of the rainbow to match their outfits, say OH MY GOD!

If you can't afford a Sebenza yet, look at the RSKs.
If you can't afford an RSK yet, look at the Spydercos.
If you can't afford a Spyderco yet, the Kabar Doziers are a great buy for the money.
If you're a knife nut, you'll eventually own several of all of them.

If you have a local dealer, handle as many as you can. Both your eye and your hand have to be happy.