Several members do this. I am still having trouble doing it (I just wanna blow my load haha), but I think you can get some good girth gains from it. I know it is the key element in the Supra Slammers. I'd say go for it.
Plus you get post-ejac shrinkage, which *could* slow your gains down. Its still kinda up for debate, and some people think its fine and some think it will mess up your gains. I personally try not to masturbate on girth days because I still have that feeling like it will mess me up. You may want to read up. There was a thread in the main forum called "Edging- this may be the next big thing for girth," and a few other threads. Try to find these and see what conclusion you come up with.
I know Supra has done a lot of posting about edging, so maybe PM him about it if you don't have any luck.
I do this at least once a day. My erection wakes me up in the middle of the night almost every night and I either edge then or when I wake up later in the morning. I try to ejaculate no more than once per day. I would like to get it down to about 2x per week, but I started off at 3-4 X per day easily.