It doesn't sound like the multiplayer applies to the roulette bonus, but the role bonus you get afterwards, the extra cash and experience.

I said it before a while ago, SE is going to have to pay better if they expect me to queue as a tank more than once. If you want shorter queue waits, you need to pay to encourage us to run our roulette, and keep running roulettes. The shortage is because tanks roll their roulette once, then don't rerun because the "reward" isn't very good compared to doing something else for tomestones.