Yes, I agree, you are crazy.
Look, if you look at any of the SLR systems Leica has brought out they have been dismal failures, and I include the S2. Leica is, and has always been, a rangefinder company. Yes their optics are beautiful, but the gear you have now is also.
A rangefinder, even a digital one is a completely different kettle of fish than a DSLR. You may find that you do not even like them. With the cost of Leica gear, that would be a disaster for anyone. I suggest you rent one with a couple of lenses for a week or so and give them a test drive. (You may need a mortgage just for that!)
Lastly, you may be looking at M9 because of it's light weight compared to a FF DSLR. If so, there are much less expensive ways to accomplish this, and you may not have to sell anything to do so.
Go to your local Camera Shop Pro and get some advice and take some test drives. If you still are sold on an S2 or an M9, then bless you.