Yeah, sorry if I came off as a bit defensive. Generally, LaunchBox tries to avoid using the same images for several different games, but it does happen on occasion. What it should be doing in that case is renaming images with the game's GUID ID at the end in that case, so that they don't end up being used for multiple games at once (that's how the system was initially designed). There are situations though when that doesn't occur.
Unfortunately though I have a feeling that if we changed this, we'd get complaints the opposite way. "Why did my images disappear when I renamed this game?" So I feel like, instead of fixing that particular issue, we should probably just ensure that images are not used for multiple games in the first place.
Edit: But of course we can never prevent the issue when external tools or other frontends are used to create images, or when a user manually places an image in the folder. This issue is really a doosy, which is why we haven't focused much time on it. Thankfully it is a relatively rare occurrence for most users.