Well if it helps you out, if you reward others then it is likely that they will be more likely to trade it around or get more people to buy into it this increasing the value where if you just reward yourself and nobody else then it is less likely to increase your value in the long run. Basically it becomes a quick buck and thats it. So how you come to a decision on what it morally right or wrong, up to you... but at least what you are doing isn't decreasing the value of the reward pool in amounts that are actually noticeable to other people.