It should be 66 euro, but for first customer in this board it will be 50 euro. By the way if you're from NA, it can be hard cuz im from EU, and some1 of us will get ping, if you want DUOQ boosting.
Worth mentioning, streaming today doesn't make you any less of a cheater. There are multiple ways out there to show the stream a different view from what you are seeing, and that is just wallhacking. Aimbot and triggering can of course be streamed.
I don't know if boosting is against Steam ToS or w/e but I'd imagine it is considering getting players in a rank where they don't belong ruins the experience for 4 other players every game they are in. If you want to get higher ranked I'd suggest looking into ESEA Instructors such as n0thing, or just a streamer offering lessons.
Of course boosting can be done silent and clean, but the creator of this post has boosting all over his Steam name.
This is just my thoughts and opinions, I'm not bashing on the poster/booster, I'm just saying there are better and safer ways of getting better at the game/higher rank.