This tool will actually show you which bots do and do not comment after you pay them for promotion - https://steembottracker.com/ - I look forward to seeing if you only use non-commenting promotion bots from now on to see if you really mean what you said.
And for the record (something you'd know if you were actively participating in the Steem community) most people feel that paying bots for promotion pollutes the Trending page - "it's spam and it's unwelcome, use the Promotion tab" - is what many people say about paying bots to promote.
Honestly, I think the whole reason you started downvoting them in the first place is because you don't actually want it known that you pay bots to promote your posts. Use the link I gave you and at least you won't have that problem.