I have a well-equipped PA-28 Warrior which I lease out when I am not using it. I have been doing this for 5 years now and charge £99 per hour (before VAT and not including landing fees). I have yet to make a profit.
Because I lease the aircraft, it has to be on a "Public Transport" ARC (C of A).
That means that the fixed costs (maintenace, parking & insurance) come to something around £10,000 pa.
Anyone out there who thinks you can make a killing out of leasing such a simple aircraft should go out and buy one tomorrow!