I'm not sure people say to stop completely, just to really slow it down. I believe in the mystery method it says to limit it to once a week.
But when you really think about it when you don't masturbate it will make you want sexual gratification more and it will make you want to meet woman. Plus if you masturbate too often your sexual performance will go down.
I suppose the ideal PUA doesn't even need it, they can get plenty from other sources if you know what I mean
A while back I didn't do anything sexual for a long time (I was religious), like months (it was tough!) but I felt good about myself; like woman didn't have control over me. Plus I wanted to interact with woman WAY more
But seriously its pretty tough if your not getting it from any where else, just try not to do it all the time. Real physical intimacy is way more fulfilling then just imagining it. Thats what it really comes down to