Rugby and soccer audiences should not be compared. Gosh in Aus Union and League should not even be compared. Very few SA rugby supporters support a team cause their Daddy do and cause they stay in that city.
SA have big stadiums and every team has it's own "style" - Sharks and Bulls supporters tend to stay away if their teams go through a big slump.
Lions always have more of the visiting teams supporters on a any given day and the Stormers matches are always packed, good or bad years.
Cheetahs are always half full/empty. But when all goes well you can easily get a 50 000 seater full for a Bulls Sharks/Stormers game.
Then also don't compare a 3/4 full SA stadium with a smaller one in Hamilton - just not fair.
Remember SA bring most of the income to SANZAR, gate fees do play a part.
With the favorable airing times I prefer to watch the games at home, starting at 08H35Am with 2hour intervals. The last two games are either at 3 and 5 or 5 and 7PM
That is 6 or 7 games on a Saturday with friends while doing whatever you fancy - I my case have a nice barbecue(braai) and/or potjie and consuming enough alcoholic beverages to make you frown the next day. The woman either watch with us or have their own chatter and the kids are playing/swimming or whatever. All in all these home events are well attended between friends. Anything for 8 to 30 people. I have invested a lot over the years in a proper entertainment are with big-screen HD TV, proper sound feeds, bar, pool table etc. As professional as a normal consumer can go.
I do take my son to one Springbok game at Loftus every year. That is the big event and a highlight of the year.
Every 2nd year we have a bunch of Bulls and Stormers friends that go to Loftus as a crowd and make it a full day event.
On the odd occasion one do get a corporate box ticket (sponsored parking,match ticket, food and beverages) or corporate invite and yes off course we enjoy those at the stadiums.
Leisure reading on crowd attendances -
http://www.superxv.com/news/super15_rugby_news.asp?id=35685#.U2jKnXaLUS4 (2012) figures
http://www.greenandgoldrugby.com/going-with-the-crowd-super-rugby-attendance-trends/ (up to 2012)
http://www.sport24.co.za/Rugby/Super15/Stormers-lure-top-crowds-20130802 (2013)
Have gone a bit off topic - Is the S15/18/20 economically viable and sustainable - yes, no doubt about that