Sell or not to sell mineral rights

I received a letter from Mayhawk Energy in Norman wanting to buy my mineral rights, Section 9, Township 4 North, Range 8 West. In the past, I was told through this forum nothing is going on there. Had a 3-year lease that expired in 2017.

What exactly are you asking?

Guess I would like someone to look in their crystal ball to see if there may be some activity. Why do they want to buy my rights if nothing is happening?