I have owned a 4 seat tourer for 3 years now. One can show figures/costs in lots of different ways but here's my best shot. Hope it helps rather than hinders.
The costs were as follows:
£23,000 to purchase. Engine 850hours TT 3000hrs
Year 1 50hr £350 annual £2000 Insurance £1700 Parking £1200
CAA/Radio/other bits £1000 Total £6200 (ish)
Year 2 50 hr £400 STAR £3000 Insurance £1800 Parking £1200
Other bits £1000 Total £7000 (ish)
Year 3 Interior refit in Leather £6000 + £6000 for maintenance, parking etc.
Year 4 Sold half share for £16000 so now costing about £3000 per annum. My flying partner was carefully selected to ensure the same high standards of maintenance would be possible.
So, my net cost for 3 years has been £33,000 or about £11k a year, £900 a month, £225 a week or whatever way you want to look at it. Plus I still have a share worth around £15,000 given 18 months to the next STAR.
I fly twice a month to France, regularly to Newcastle and Bournemouth for family reasons and a few times a year into "fly-in" like Duxford etc. For £15 quid an hour to an instructor, I've redone my IMC completely.
Is it all worth it? For me, Yes. As to anyone else..go figure..