Oh yes there are rewards. Maybe not directly. Because to my knowledge musing offers no such compensation in their business package, but indirectly there a quite a number of ways you and the entire platform can benefit:
First by giving musing more steem power you give the opportunity to cast bigger votes, which would provide even higher rewards for people on the platform who asks and answer questions. Yourself included. So in the short run if you keep being a dilligent muser (I called people who using musing musers) then you can expect to get a return in terms of even higher rewards dor your efforts.
Another way you benefit also steems from the above, that is the higher the steem power musing has the higher the reward, the higher the numner of people who wants to use musing, the bigger the platform gets, the more curators we have, leading to higher efficiency leading to even higher number of users... on and on in that beautiful cycle that in the ends come to benefit us all abundantly!
So you see that while there may be no short term immediate reward, there is a more fruitful indirect long term reward. Have a nice day.
Cheers XD