There are many reasons that you may want to sell your oil and gas royalty interest, but a lack of knowledge regarding the worth of your royalty interest could be very costly. Whether an inflow of cash would help you make ends meet or finance a large purchase; you no longer want to deal with the administrative paperwork or accounting cost of reconciling monthly revenue payments; or you would prefer to diversify your portfolio or move your investments to a less volatile industry, understanding how royalty interests are valued will ensure that you maximize the value.