I would advise against it. I used upvote selling services like MB and Smartsteem quite a bit for a while with little success. I did earn maybe a couple hundred STEEM which is something you earn in 3-4 days so the gain in that regard for you wouldnt really mean much. .
But with the promotion side...the truth of the matter is that if you arent spending enough to get to top trending, you arent achieving much.

The reason im saying it would probably be a bad move for you is that you are already one of the top 5 most rewarded authors on the platform because of the Xeldal upvotes. If you started boting, it would hurt your reputation quite a bit.
The engagement quality would drop the more bots you use and you would basically get the comments like chbartist is getting.

If you want to give it a shot go for it... but i really dont think you need it.