eBay is generally not in a position to evaluate whether an item is genuine based on a photo in a listing, nor is eBay willing to just take your report at face value, since you might be a competing seller rather than a disinterested expert.
Keep in mind that it is entirely possible for a scammer to copy a legitimate listing and photo but intend to deliver a counterfeit item instead of the real thing. In that situation, there is literally no difference between the legitimate listing and the scam listing, and no policy violation within the listing itself.
If eBay receives multiple reports from independent users, that might cause eBay to look further at a listing and possibly take some action.
Reporting a listing is more effective when there is a blatant policy violation that can be pointed out and noticed by anyone without requiring specific expertise.
