I received those offers myself but I don't really see a point of it, my vote is not overly valuable because I blow my steem recklessly and without thinking.
The bought whale boosters are sort of the advertising, everyone can use it and it is not illegal.
But, it also means that you have to pay to get something in return. It can get you a little bit more, but not much.
Like in the real life, you have to pay for the things, but does it mean that your money which you use to pay that came out of a thin air, or you had to work for it?