Not sure what the issues in detail but as I understand it G-UIMB still has around 400hours in use as it is almost daily instructing new pilots. I think a private owner might take a few years to click up over 400 hours...
That said it isn't "no warranty" it is a parts warranty and its not a case of being so rich, etc. Look in the end you know whats cheaper than a Cabri G2? A car. Still too rich? Get a motorbike... cycle.. walk...
In the end flying isn't cheap and if I was a person flying privately with the resources to smoke around in a new Range Rover (which is what £100k with a spec?) then truthfully if it costs me £290 per hour or £350 per hour for my 50hours a year thats a delta of £3000. So I'd vote with staying alive, like the old motorbike saying goes, if you have a £20 head get a £20 crash helmet.
Don't get me wrong i see the point you make but think it is over played and I don't see "niggling problems with senders and electrical items" as a show stopper.