I have about $13,000 invested, purely from being bored. One of the biggest mistakes I have made.
I did however, get to learn many new sampler/drum machines. Beautiful creations, a lot of them are. I am now selling half of my equipment in order to get ready for college.
My favorites are: Yamaha RS7000, MV8000, ASR X Pro (the sequencer really is shit, but you can work it), E-Mu Emax, Yamaha SU-700, Roland SP-505, and the E-mu 0404 soundcard.
I learned that KRK-RP8 montiors are a bit shitty.
Unfortunately, after all this money spent, I never got the setup I really wanted. Though, that MV8000 is something beautiful.
My dream setup is:
1) MPC4000
2) Adam A7 monitors
3) Roland V-Synth XT
4) Kurzweil K2000 Rack
5) Axiom 49 Controller or a WORKING Alesis Fusion.
6) Ensoniq DP-4+
7) SP-1200

LINNDRUM II !!!!