Personally, I prefer to have just one or two really good loads a night. The times I have shot more have usually been because of bad, rather than good, sex, when I ended up beating off in frustration.
But, this thread does remind me of something astonishing I saw late one night about 4 years ago at The Power Station (sex club) on Otis Street in San Francisco. There was a dark, medium-sized room with a TV in it showing porn videos. A bunch of guys are around the perimeter doing whatever. In the center, there is this small table or pedestal, waist high, about 6 feet in front of the television set. There is a decent looking guy standing on the table in a crouched-down position. He's got his fairly large and thick cock in his hand, and is jerking it off furiously. About a minute after I walk into the room, he shoots a healthy load. From the way he was going at it, I thought he had just seen something hot on the video, and had to bust a nut. But, no. He stops jerking for just a moment while he is actually spewing, but then immediately goes back to jerking off with the same vigor. His cock stayed totally hard after shooting-- whenever he let go, it would pop up like a spring. He continues jerking off, and cums again in 5 mintutes or so, another good load, and goes right back to jerking off. He repeats this again and again. Once in a while, when the video got boring, he would pause for just a moment and climb down, to get a drink from the water fountain just outside the room's door, or to pick up another little cup of lube. (They had little paper cups, and a pump dispenser filled with I think J-lube, just like Mc Donald's has for ketchup.) He didn't seem to want to have sex with anyone, but just to be an exhibitionist on his little pedestal. I don't know how long he had been at this before I got there, but I personally saw him blow six loads or so before I moved on. A considerable time later, when I wandered back through the same room, he was still there, still at it. Much later, as I was getting ready to leave, I walked through the room again. He was gone, and the room was pretty much cleared out, but the top of the table, and the floor in front of it, was still covered with big white puddles. I can only guess how many loads he shot in total, but if he kept going at the same rate, the half-dozen I saw were just a fraction of the total.
Thinking back on this, I have a feeling he shot his cock up with caverject or whatever, so as to have such a solid erection for so long. But even if this was the case, I am still very impressed by the sheer number and volume of his loads. Long after I would have been firing blanks, he was still blasting wet loads.