I don't know what to tell you... there are a lot of newcomers to the platform who are desperately wanting to be seen; some are just plain greedy people wanting a "free ride" from those with seniority and influence.
I don't have enough SP to have had to worry about this particular phenomenon, but I also know some of the big whales get 100's of messages like that daily. Personally, I prefer to find new content that is not "solicited" like that...
I never figured there would be this much interest in buying votes. If the price of Steem keeps going up you may soon have these issues as well. Oh well, it does keep blogging interesting, I'm having fun and trying spread out the votes as best I can.