I understand the general thinking behind this, I'm not sure about it's wisdom though. None of this is criticism, so please take it as constructive discussion.
Firstly, I don't see it generating new sales or customers. At best it might shift the customers focus away from an unbadged item and onto a badged item, but the number of sales will still be the same, the customer will just be spending their money on different items. So the net gain here seems to be zero.
The wording on the badge is "Top quality approved by CGTrader". This implies very strongly that an inspection process has been conducted on the actual item, and it has met certain quality criteria. These criteria must be very well thought out if the customer is to trust it. The criteria must only be about the model itself, not anything to do with sales, views, likes, etc, or even the reputation of the designer. The criteria must be entirely from some sort of examination (manual or automated) of the actual item. Even the best designers sometimes make mistakes, like forget to load a texture, or something. Personally I'm struggling to understand what sort of automated process can judge quality with this level of assurance, but I'm happy to defer that to cleverer people, and accept that it is theoretically possible to have such an automated process … I'm just sceptical for the moment!
At the moment approximately half my items have the badge and half do not. I'm hoping this is because this is a "limited run" test and not the fully blown process. All of my items are made using the same technique and tools and they are all of a very similar likeness because of the niche market I'm catering to. In other words I would expect either ALL of my items to be badged or NONE of them to be badged. As it currently sits with half/half, it strongly implying the process is not working or is flawed in it's criteria.
I also have something of an issue with what will happen to items that don't receive the badge. A perfectly good, well made item may be loaded, but for whatever reason it doesn't capture the customers imagination and ends up being a non-seller. No fault of the model or the designer, just the whims of the marketplace. If the item is also unbadged, then it will likely remain a non-seller forever as customers will incorrectly judge it to be flawed.
Then there is the reputation of CGT to take into account. If the automated process fails for some reason and assigns a badge to an item with an issue, then later a customer downloads the item and finds it flawed. This would immediately cause them to question the value of the badge in the first place, and unlikely for them to trust it again in the future. And CGT would have a damaged reputation because they endorsed something that was flawed. In other words, the process that assigns the badges has to be absolutely bomb-proof.
Okay, sorry for the long post, hope it was of some value.