I'm not that keen on the idea of hot shoe finders, but then maybe I'd have to try it to see, it might not be that bad. One worry would be about the vunerability of the finder. And how worried I'd be about that might depend on the cost of replacing them.
I agree with you Lee, it does put me off, though I know at the same time I'm being a bit silly. Anyway I don't need to worry as I simply can't afford a Leica at the moment, but as you say prices are slipping.
Meanwhile I have come accross A Canon QL17 G3. It may need a little work to get it going again, but if I can get it going it should give me a taste of rangefinder shooting.