I guess it all comes down to everyone hating that feeling of helplessness. You know what I'm talking about; that SC team that kills entire teams in less than 10 GCDs (it seems).
When that happens, due to coordination, skill, renown ranks, gear, group comp, etc. your hands are tied and you have 13 minutes to kill for your 1 token and freedom from the SC.
Een forming a team to be competitive can be an issue because overcoming the RR and Gear issues early on will still leave you in a severely handicapped position.
In Zaxxed, we play oddball group comps and try to have fun. Against the really good DPS Trains of Destro, we have to try and PvE to win as we cannot compete on pure kills. We win SCs 500 to 440ish, with 13 kills versus their 33 kills. So who really won? The renown rewards they get are 3x ours, but we get tokens for gear, etc.
So unless you want to beat that META 6-man team, there is no external incentive that will lure you into that pain and suffering.