If you went through the Brisbane side this year and compared it to Parra's I reckon many people would say Parra have the better team on paper, based on rep games etc. Brisbane only have Lockyer, Folau, Thaiday and Hodges who are Test standard players and have lost the likes of Hannant, Hunt, Boyd, Civoniceva, Taylor in recent years. The rest are kids mostly or relative nuffies like the front row. Parra have Hayne, Moi Moi, Cayless, Hindmarsh, Inu and then went and paid a heap for Poore. I don't think you can say they are missing out on top players. They made the GF last year FFS, with almost the same squad.
And Brisbane have gone through some leaner years anyway, like when they have finished around 7th or 8th on the ladder. And you have to think that the champion nature of Lockyer was the only thing keeping them in the hunt in those seasons too. In fact take him out this year and they'd be out of the eight for sure.
You can complain about the salary cap for several reasons but saying it hasn't evened out the playing field isn't one of them. Brisbane would have most of the Qld side if they were able to spend what they like.
I reckon Parra have had easily the best looking squad on paper in the league for the past few sasons..