I wouldn't charge too much for teleport. If the fee is high then so few people will use it that it might as well not exist. I can go for charging 1 btcd for max security setting but if the coin reaches 10 dollars or more then sending just a simple transfer would be pricey at 1 btcd per low setting teleport.
it wont be a fee, just a requirement to have it, you can and should be staking with it
the fee will be something small like 0.1%