Mineral rights in Texas

[Shea Spinelli]

Does anyone know whether it's customary in Texas to leave the mineral rights with the prior owner? The seller is requesting to keep the mineral rights after our sale is finalized. He said its normal and it's a big deal to him as he's mentioned it a couple times. Normally, the owner prior to him has probably retained the rights. This saves us from the research, but am I giving up too much by not bribing the rights over with the sale? It seems a long shot that there would be any profit from them considering it's only two acres, but thought I would ask if anyone has an experience. Thank you in advance.