I think it works like that with tc boosters
adding a 500 tc booster to a 1k one
making a 1.5k for every win
but i dont think the earning rate increases to 200 games
think it sticks to 100
but with Qi boosters i dunno realy
I asked hampa the same question, and he said TC boosters do not stack, only mobile boosters stack.
I think the same applys for Qi Booster, it just adds another month to the subscription.