I was wondering what happens if I buy , for example, 5 qi boosters.

Do I get 5x2 = 10 times more qi, meaning 10qi pe game or
Do I get 2x2x2x2x2 = 32 times more qi, meaning 32qi per game.

?

can anybody help me?

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.

okey, thank you