Just attempted to join one and got told "first two matches we (organisers) boost then you two (who wanted to join in this case me and someone else) we get two turns. Sat through 20mins watching those two boost for them then to quickly leave the party and game not giving us our turn. Sad selfishness.

These two people are (gamertags);

Dowd xo
LuX JordzY

Don't bother joining their games if posted, instead file complaints to them.
Feel free to add anyone else's gamertags who are also just sad.