For Johnsons, it's good to know that you can get your hand stamped as I did not know. I have dinner around 6 pm with a friend in time to arrive at Johnsons before the 8 pm cover, and sometimes we are rushing to avoid the cover charge (like if we have leftovers and want to bring them home or put them in the car).
Concerning dancers at Johnsons, you have very slim pickings if you are avoiding the Latin guys as it seems to be at least 3 out of 4 guys. And even many of the non-Latin guys are heterosexual. It's telling that some of those dancers are NOT even overly aggressive in getting privates; it could be a personality issue (they are bit shy) but I wonder if it is also because they are less comfortable because they are hetero. There is a very hunky non-Latin dancer that goes to the corner after each stage dance, and I don't think he has ever taken any back for a private (and he appears to be such a nice guy). But I do prefer the less aggressive types....
For LeBoy, I meant athletic as you mentioned - swimmers/gymnastic build. I think that is the common thought or perception, as opposed to the muscular or bodybuilding types that are mostly at Johnsons.
I guess one possible advantage for you if LeBoy/Boardwalk charges for the private room every time would be to choose your favorite dance for multiple dances that could hopefully get intense, rather than having many dancers, some of which may be disappointing, and perhaps spending more money and being less satisfied with the one private room cover charge. My friend who does a lot of privates at Johnsons usually takes 3 or 4 dancers and is frequently disappointed. He really has one favorite BB dancer, Tony, who comes in around 10:30, and we leave after he does his 2-3 dances with Tony.