SSD
yes, my aeroplane will appear on radars, but it will be anonomous, and that's fine since if I'm not talking to a controller then I'm outside CAS and nobody needs to know who I am
In reality everybody with a radar can see exactly who you are, because there is enough radar cover around the UK (most of it unknown to you and not available as a service) to track you from the moment you get airborne at airfield X to the moment you land at airfield Y, and unless X or Y are farm strips with many aircraft movementsand nobody keeping records, they (whoever "they" are) can usually find out who that radar blip was. Unless you fly pretty low down.
I can see your point about cost to a degree*, but equally this is a debate that will go on until GA is reduced to a few old planes operating from farm strips. And make no mistake about it, this WILL happen. Just look at the falling new PPL numbers, the ageing pilot population and the ageing GA fleet.
* Unless you fly from your very own farm strip, your flying is very probably made possible by the PPL students who spend a small fortune on landing and T&G fees and who keep your local airfield open. So you (and I) are already receiving a big subsidy from others.