lol, that's because PSN is free w/ the PS3 and since up to this point those that are buying the PS3 are willing to spend $400-$600 on a game machine, I would bet that nearly 100% of them have internet. So it will always have a higher network attach rate.
Question is, who is making more $$ off of their networks? MS, Sony, or Nintendo.
MS has the annual membership costs + arcade and movies for some time now.
Sony has a smaller library of dl games than MS or Nin and just now started movie dl.
Nintendo has a larger dl game catalog than either from the best old school consoles.
hmmmm. I would bet MS is making the most $$ from it.