With oil prices projected to hit approximately $150 bbl within the next 6 to 7 years according to the CIA World Fact Book, a mineral owner royalty of 22% is more in line. Also, the oil companies know they will come across some real "hard heads" every once in a while, and the company is prepared to go as high as 25% (1/4). Of course, the landman gets nothing. The landman generally has (I don't know if this is still true) made his money on the difference between what the mineral owner/lessor was willing to lease their rights for subtracted from 25%. So, if the owner settled for .1875%, the landman received .0625% as his commission.
Learn to deal, and if need be get a forms book on requests for proposals and send a solicited RFP response request back to you from ABC, GEF, HIJ, etc. etc. exploration and production companies and pick from the best submission (after a little fine tuning) from a company that will offer you closest to what you want. Remember. Its your minerals and no one has the right to take away your property with due process of law (i.e. you generally have had to have broken the law to forfeit your property).