Pam, I suspect that the offers you have received for your Panola minerals are related to the Haynesville Shale.  Many units are not fully developed and older wells have declined.  The lack of development means that the bulk of reserves are intact.  And old wells can serve to hold leases until companies are ready to drill more wells.  Not many new wells are being drilled currently at $2 gas.

There are a lot of mineral companies that are making offers with little knowledge of the geology or the prospective nature of minerals by specific location.  I find them making offers that make no sense.  Of course if you signaled that you were or might be a willing seller, they could do more detailed research.  When that happens, they sometimes realize their mistake and withdraw the offer.