I have yet to see people puging rateds for fun.
Funny thing is that rated could work if ppl just didn't care that much about having an optimal team. The 8-man requirement was implemented to discourage quitting during match.
Let's say everybody groups up, cross-guilds and everything. That could make for great rankd play as the ELO-ratings should only pit equal teams against eachother. And there should be a lot of teams
Instead everybody gets their a-team together and the queue dies.