Hi,
I am using the Steem I bought to pay for the bidbots. I agree that it is a good way to promote my posts.

In terms of the rewards, as you are aware curation takes 50% of the rewards, and since the blockchain is very transparent, you may also know that an additional 1-4% of the reward is returned to the reward pool by early voters. I think, If you take into account these factors I am getting the cost of the votes back and sometimes a modest profit. The profit is proportional to the investment, but it’s not a guaranteed profit.