I don't apply so rigorous a calculus about "cost-benefit" ratios. To me, the reasons to spend the money on a Leica are a) the lenses, b) excellent ergonomics, c) the lenses, d) simplicity in design, e) the service and support I've received from Leica USA and Leica dealers, and f) the lenses. Did I say I like the lenses? ;-) For all its drawbacks (price, sensitivity, etc), the M-P is the most overall delightful and productive camera I've owned in a while. AND the Leica X is the best fixed lens camera I've ever owned, bar none.
The E-M1 takes more study than any Leica to understand all the options, configure the camera, and take advantage of everything it offers. I went through that and have become completely comfortable with it. It suits me, even if I seriously under-use it because I'm using the Leica so much.
Nothing's perfect, for sure. Or ever will be.
G