This is off the top of the head. Here are some facts (my numbers may be off which I guess would render my last statement untrue,lol)
There have been I believe six 24/7s put together since '07
DLH/Mayweather = 2 mill buys
Mayweather/Hatton 900k domestic / 1.1 UK (not sure if 24/7 was shown there but I'm certain it was)
DLH/Pacquiao - 1.1 mill buys
Hatton/Pacquiao- 900K
Mayweather/Marquez - 1 million
I purposely left out one but you guys already probably figured it out. That said, it seems to help and I say it's worth the promotional effort more than not but..
Jones/Calzaghe - 200-300K

definitely doesn't mean it'll totally sell. Mind you Roy Jones is still a very recognizable name. On paper that looked like a great matchup.
To me HBO should still produce 24's but put them on SPIKE, ESPN2, something because right now the only way you'll get it is if you're an HBO subscribers and those seem few and far between at times..
To the naysayers of 24/7, you all do realize that you have to create a package that the casual fan wants to see right?? I'm a huge fan of watching training sessions and will watch them all day. But the average fan doesn't want to see mitt drills, bag hitting all the time. There is a reason outside of fantasy football that the NFL is the top dog in American sports. We know (unfortunately) who Tom Brady is married to. Who Romo goes out with, that Sanchez is proud to represent the Hispanic community, why Polomalu wears his hair like that, etc... This stuff sells the game overall.
Heck when boxing was the big game in town we knew about Ray Leonard and Ray Jr, Mancini and his pops, Aaron Pryor's hard upbringing, I don't even need to mention the guy with the tat on his face.
The point is, this stuff
sells boxing but they could be doing it even better.