The other night at Rincon, I stopped by the total rewards desk and cashed out much of my comps for Shell gas cards. Since Im not going to Vegas as often -- and playing more locally -- my comp dollars have been building up and I thought buying the gas cards was the best use for the comp dollars since Im not going to shows, paying for dinners, etc. $600 in Shell gas cards cost me about $1,030 in comp dollars with the 7Stars discount.