You could get people to vote in with their actual costs. The breakdown is roughly
Variable costs:
fuel
engine fund
prop fund
50hr check (not if on a Private CofA or N-reg)
150hr check (as above)
Fixed costs:
Insurance
Hangarage
Annual
CofA annual
Cost of capital
Costs of actually going somewhere:
Landing fees
Handling fees (large airports)
Buying airline tickets for unhappy passengers so they can get back home when the weather closes in and you are stuck (narrowly avoided this so far)
The above would be well defined for a brand new aircraft within warranty. For something older, the cost of capital will be much less but there will be huge variations in existing maintenance costs, not to mention future risk - that is essentially the tradeoff between buying new and secondhand.
For a privately owned plane I would disregard the cost of capital because you can't do anything with money sitting in the bank. That can make a huge difference to the figures, and can easily make a £200k plane cost less to fly, per hour, than renting the nastiest spamcan I've ever rented.
So, what it will cost you depends on your attitude to money and life. An accountant will always say it is cheaper to take a train.
(edited to include hangarage etc - apologies)