The fees can be earned but the liquid portion required for the bridge can't really be put to work. So that means that PolyCUB will be subsidizing most of the APR and it will take away from the other pools. There is only a certain amount of PolyCUB per block and it can get diluted quite fast if there are too many pools.
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True, this is where polycub governance comes in, every pool cannot be rich, so if your have a favourite, get more polycubs deposited into the xpolycub vault to gain more governance power, so as to vote your favourite pool to get more yeilds allocated, with this, Polycub price is sure to do well and so will the entire platform.
With money comes competition, and that requires power to win.