Hmmm i dnt know much about this but from what i know that 150k is for playing that cup match without regarding a win or loss!!!
If u win u will get bonus!!
And the prize money for league,cup or champions league changes respective to level!!
For eg :- Hmm i guess you are level 1 or 2 now and you get 150k and i am level 5 now and i get 1.11 for a win and 657k bonus!!
Its like as your sucess increases your reward also increases !!! :P
I hope this helped you!!