As we all know, a year ago or so Envato has implemented the new system of Trendsetters. That was an excellent idea because such feature giving a great opportunity for new items, plus authors could earn a new shiny badge.
But eventually, people started to crack a system.
While Envato doesn't share the details of the Trendsetting algorithm, it is evident that this depends on comments per item and other things like views, sales, etc. Usually, ~25-30 comments are enough to earn such a fake reward and also get some priority in the search engine, what is honestly, entirely unfair.
So my suggestion would be to review the Trendsetting algorithm once more and maybe make it a bit less sensitive to comments variable or remove it at all because people are gaming the system so hard. The item can't make a new "trend" only because the one got ~30 (mostly fake) comments and 0 sales, this is ridiculous.
Just my 2 cents.