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There should be nothing bad when the content is good and a boost is requested!

believe me these guys will see this a lot different like you, they will soon start downvoting your subscribers because they mean (like many more) that this is some sort of abuse of the communities reward pool.
There are some honest ones,and there are a lot more ones which are acting doubleface because the provide such services stated before for a long time with huge success and now they are stating that this is something bad even if they bring up their accounts with that methods which is now totally forbidden.
But never heard some good excuse from one of these guys for the past gains with this manner, did one believe the will give the gained assets back? No way, and today they will play judging all the others for abusing the reward pool, this is so silly.
Think about your idea again maybee you want the right thing but not use the right tool ;)

There is nothing wrong about promoting / boosting a nice content post! whatever it is.
We will start doing a counter downvote pool for the abusing non sense downvoters
At the end equilibrium will find itself