Is my wife being selfish

My wife will only agree to sex under the following conditions. She writes a number from 1 to 10 on a piece of paper and folds it so I can’t see. Then I have to pamper her for at least an hour and during that time give her at least 2 orgasms. When she feels ready we stop and I have to guess the number. I can be as much as 2 numbers out (eg if she writes 5 I can choose any number from 3 to 7). If I guess right we keep going and make love. If I get the exact number I can choose between making love or a blow job, but I’m not allowed both. If I’m wrong I have to give her another orgasm. Afterwards I must wait at least 48 hours to try again. I don’t know where she got this idea but asked me to do this as a sex game for 2 weeks when we were on holiday about 3 years ago. The 48 hour gap didn’t apply then, she made a limit of maximum 3 times a day. It was fun at the time and sometimes she gave me little clues for the number. When we came home she wanted to keep this going but imposed the 48 hour rule for practical purposes. I agreed and we still had a lot of fun but after a while the clues stopped and it started to feel like she craves the victory if I guess wrong. Since that holiday it’s the only way she will entertainment sex. I don’t mind in some ways but sometimes I feel like she gets so much enjoyment from it but so often I have been left feeling disappointment about not having made love especially if it gets to 3 or 4 wrong guesses. I feel like I’ve spent maybe nearly 2 weeks giving her multiple orgasms every couple of days but got nothing back. I have tried talking to her about this but all she says is ‘you don’t have to give me all those orgasms, I love them, but really I let you give them to me so you get the chance to maybe make love to me’. She claims she really only likes making love now and again perhaps every 6 or 7 weeks and this would be the alternative if we stopped this game. In other words, she loves the orgasms just not the whole making love thing. She sees this as we both benefit, she gets me giving her loads of orgasms and I get to make love to her more than once every 6 or 7 weeks. If I’m really lucky it could be 2 or 3 times in the same week. I think she is being unreasonable but would like to know other people’s opinions, am I making a fuss unjustifiably?