From a dollar vs capability calculation, twins represent a pretty good deal.
For example Barons are selling for less than the same model year Bonanza's, yet are 30 knots faster, carry more, have the redundancy of 2 engines, 2 vacuum pumps, 2 alternators, and many have deice and radar fitted.
Yes the total ownership cost will be more but you are also getting a lot more airplane. The big problem is finding a twin that has been properly maintained. There is a lot of neglected junk out their but a twin in good nick will not cost significantly more to maintain than the equivalent single and so insurance and fuel represent the biggest source of extra expense.
I don't get the P2006 for a private owner. If you are over 55 years old, for the price of a P2006 you could get a nice Baron/Aztec/Cessna 310 and pay for all the fuel and maintenance for the rest of your flying life and still be ahead.