I agree with the fact this is something we should not use.

If the point to such service is karma whore-ing, I suppose it's "lame".

The point is it's very hard to know when the service is active or not, and when something should be posted to be (potentially) read by the most, to be fully efficient for the community.

I have no doubt that if some post doesn't provide any interest, it won't be up-voted. So, even if such "tool" is used, the power of it is kind of relative.