"And Up Through the Ground Came a Bubblin' Crude"

Remember the theme song of The Beverly Hillbillies?  (It was by far the most creative and entertaining part of that series, although watching Max Baer chew his way through the scenes as Jethro was sometimes amusing.)  I was amused to find this oil well for sale:

Asking Price: $51,600

Gross Income: $23,500

Cash Flow: $21,050

That is such an impressive return on investment that I am immediately suspicious.