That quote from Oscar Wilde brings up a good point about intent which is important.
To be clear there is nothing wrong with feeling cosplay/homages are tacky and not liking them. Everyone is different and has different tastes. With that said, it's one thing to simply not like cosplays/homages and another to try and use the FUD of the game getting shut down because of them as a means to prevent others from making them.
Was looking for this particular video and wanted to add it here as it is on point with regard to infringement and trademarks. This is a video of Vic Mignogna talking about CBS, Trek fan films and what happened with Axanar. Won't go into enormous detail as it is a rather lengthy story, however Vic Mignogna wrote/produced/directed etc. the Star Trek Continues fan film series - he has been in the trenches and knows what he is talking about. In the video, he talks about CBS (who owns the rights to Star Trek) had encouraged and supported fan films for decades. CBS never blinked an eye about fan films until the moment some idiot came along and tried to make a profit from it. That is where CBS drew the line and forced them into legal action. You can consult the oracle of Google for the specifics.
https://www.youtube.com/watch?v=zbjgYZ1kzE8
I'm of the opinion most IP owners are like CBS - they don't mind people making fan films or cosplays so long as people aren't trying to make a profit from it. They realize people putting their time, effort and personal money into making these films or costumes or mods/skins for games show the great affection people have for their work. It's a sign they did something right and that people like it. They aren't treating it as some call to arms to protect their property.
That is not to say all IP owners are like this. I'm sure there are the more litigious types out there. However, I personally don't see this as a problem to be concerned about.
P.S. If you haven't yet seen Star Trek Continues, give it a shot. They are on YouTube. 😀