There is no such thing as too many kits. :-)
The better question to ask may be "How many kits do you need?" and the answer to that one would be "Just one more." ;-)
Myself, I haven't counted my kits to get an exact number (I'm actually a little scared to) but my best, rough, guesstimate would be 100-150. My opinion on it is even if I never get some of those kits built though, half of the fun of modelling is just opening that box, pulling out the sprues, and dreaming/planning/scheming about what you would like to see happen to all those little pieces of plastic. That to me is worth the price of admission right there. And, as they say in the ships forum, "Whatever floats your boat!" :-)
Well, I've gotta go...I have a dream...
Ray