I dont know how much I really spent on the studio... Around 15.000 all in all. And yes, I am very happy with my setup. It took me quiet some years to get where I am, but I didnt save up for it. I bough what I have now, in about 3 years time, bit by bit.
I spend all the time I can get there, but at the moment, I am kind of out of creative thoughts....
I can defintely do more with my gear than I am creative, so I would say I could do the same with less yes
I am going to get 3 more synths that I have owned before, but are on my wishlist, and then im done really with getting gear:
Roland Juno 106
TB 303 with Devilfish mod
Roland JP8000