When we want to make and publish an item that has never been done before on CodeCanyon, do such unique items have a higher acceptance rate by the reviewer, or are such items risky?
It would depend what it is
You have to create something that people will want to buy and adds value as market suitability is part of the review process
Again without seeing what it is it is very hard to judge but finding something entirely new is rare and there may well be a reason that it has not been done before
It may be wrong to say that it is completely unique, there are precedents, but its usage and logic are different, it is unique in terms of its purpose of use
I could be completely wrong but that immediately sounds over engineered and like you may face an issue with buyers not understanding your intended ‘purpose’.
Designing/coding for a stock marketplace is VERY different from doing it as an agency or for a client
Thank you for the answers, we will see the result when I finish the item