These figures are going to vary substantially according to how old/new the plane is, and how much you get involved in who does what on it, whether you do your own 50hr checks, etc.
Also hangarage varies a lot according to the part of the UK. In the SE it can be £7k/year easily.
I pay ~£2.5k for insurance on a 2002 TB20, CPL/IR with 1500hrs. Annual £2.7k, do my own servicing in between.
Any less than 100 hrs pa. I don,t think sole ownership would be viable
That depends very much on how much you value sole ownership
The benefits are
massive. To people who "go places" and can afford it, it is
priceless. Those who can't afford it obviously can't do it!
If you fly much below say 50hrs/year then you may have issues with engine corrosion, unless you take care to fly very regularly.