I have zero issues with people getting on trending organically, I want great post up there. I am strictly saying if you want to promote on trending you need to pay. If google ad words was free, google would have failed.
Regardless if you think your content is good or not, trending space should never be free, ever. UNLESS Proof of Brain puts you on trending, it should never be free to ADVERTISERS, content creators that "earn" a spot on trending did not get it free, they got it by making content others wanted to see. Chicken and the egg, organic trending brings eyeballs which bring advertisers.