I got the dmania bot upvote like 4 times in 2 weeks and still didn't make the list. Those guys like garudi and bien must be hitting it daily. Depending on price of Steem the dmania bot vote is like 70-90 dollars.
I guess the only downside is dmania takes 25 percent so if you do it a lot and never get the bot vote it could be cost prohibitive if you use upvotes to get in their trending section