Maybe I'm slow today but I'm not quite sure I understand. This is how I see it.
Maybe the agency page is less cluttered but doesn't the massage advertisers page get more cluttered? And now someone looking for SP announcements has to look in two forums and people looking for massage announcements have to weed out the SP's announcements. As well, many SP's are outcall and massage is almost exclusively incall.
It may seem logical from a $$$ point of view to keep advertisers happy (only some of them in this case) but it doesn't seem so in a logistical sense, IMHO.
Having a separate forum for indy SP's exclusively makes more sense than putting them with massage and creates less cluttered forums all round, if that's the goal.
Not a huge issue, but it just seems odd to me.