Giving a " tip " to an author is great use of a bidbot.

The purpose of having the XX amount of upvotes on your post is to make the article look active. For example someone is browsing Steemit and both you and I have an article on cooking.

For this example both our articles contain the same information and is equally as good as the other. One article bid bots were used on and fake upvotes purchased and the other article is organic.

The article that the bidbots were used on would have more cash value added to it and show more upvotes and likely more replies due to the article being in the " hot " or " Trending " Page of its tag. The organic article would have less making the article look less active. And while they both may contain the same info ... the user browsing Steemit is going to naturally click the article of interest with the most activity on it due to the fact it looks like that is what everyone else did, making the promoted article look like the better article.