Actually there are two different way of getting more payout for hte posts:

• first, one a user has much Steem Power and delegates that to "Delegate for Upvote" system, such as @upvu and Co. This is what Investors use, because for delegation they receive daily upvotes and do not really pay attention what they post, because the Upvotes comes no matter you post. Of course, that can slowly spoil user and contribute that they may post something without paying attention to its quality. Understandably not everyone is posting rubbish but it is something that could happen

• another way is when user does not have big Steem Power that he could delegate, then he can pay Steem and buy upvote, it depends how much you pay, for example this user paid 104 Steem and you can see there should be link to the post:

And, he received this for his post:

I actually do not know if they benefit from this second system, when the posts generate SBD then they may benefit from it but only with Steem definitely less.

Overall "delegate for Upvote" bring more than the second way for investors. Both of them will be considered as Upvotebots