A lot depends on how many hours you fly a year. Running a typical spamcan will cost an average of £5500 a year in maintenance (assume 100h) and around £5250 a year in fuel (assume 172 100h). On top you have insurance (£1500) and parking which is very location dependent. That gives you a cost of £122 an hour not including parking.
The advantage is that you have very good availability, you can do a week in France at almost no notice and you know no one is abusing your pride and joy (except the engineers, of course).
Do you need IFR or night capability?
Rod1