Retractable gear and a variable pitch prop carry a large maintenance cost overhead for a private owner
Only if the owner completely neglects the most basic maintenance, or permits some muppet maintenance co. to do that.
I fly a
TB20 whose landing gear has cost me practically nothing over 10 years, but then I pay an extra ~£200 every year to have it properly greased. The VP prop costs more than a fixed pitch prop but in terms of direct flying cost it is of the order of £3/hr extra which is easily recouped in the fuel saving through having a much better performing aircraft. The retractable gear costs are recouped many times over through the 10-20% fuel saving for the same IAS (Cirrus salesmen will vigorously deny that, but they
would say that 
).
Having said that, I would choose a TB20 anytime over an Arrow - the two don't even begin to compare for a human-friendly modern cockpit.