As for the lockout penalties, even if you raise it to 8 hours total content suspension (FF14 basically becomes a glorified chat room)/ remove roulette bonus/ strike 10 recommendations off them/ etc. People are still going to leave; why?

1. As Duuude007 pointed out, lockouts? Go to sleep! Play another game! Go out to eat! Actually do real-life work! All these will essentially null your x hours lockout.
2. Most people are doing roulettes simply because they don't want to PF (the reason is usually hate organizing/ laziness/ time killing), lock them out and it's PF Brayflox SR we go! (or real-life)
3. People will never think of daily roulette bonuses as precious (especially the low level roulette's 100 myth), even if you wipe the daily bonus on quitting, people will still quit (100 myth = 15min Brayflox(es) if you 'SR' it with 2 MNKs vs. low level roulette which is around 30 min).

My advice is... make a tank/ healer. It is nearly impossible to fix the problem. Well, apart from removing the whole roulette system. SE's motive was to attract the few kind people to help the others; unfortunately, there are just more jerks around.