I don't know where people get this crazy idea that being a male porn star is such an easy job, or that you can just take any guy with a big dick, throw him in front of a camera, and get a great scene.
The fact is that there are many important qualities* necessary to be a good male performer, and very few guys possess all (or even most) of those qualities. So, that's why you keep seeing those same guys over and over again.
As far as I'm concerned, the quality of the male performers at LP right now is probably the highest it's ever been, and certainly much better than at any other studio that I'm aware of right now.
*For a discussion of what I personally think are the five most important qualities, see here:
viewtopic.php?f=96&t=7669#p26901You'll notice I didn't include size or quality of cumshot on that list, as I personally consider it to be fairly trivial, but if you add that in, that just further shrinks the available pool. The bottom line is that great male performers don't grow on trees!