In terms of attendance in general, I've used the arena pricing helper on the USA offsite since season 17, and found it to be pretty much right on target. I was sure to increase prices over the suggested rate in seasons where I promoted. But it was spot on for pricing after the promotion bonus wore off, and for the first home game this season.
One potentially important factor might be PR guy level. I've been rolling with decent PR guys for some time, so maybe low level PR guys are much less effective? I've never really seen serious analysis about the effect of PR guy level.