You won’t really know the outcome until you have done it. If you, as an author, feel like it’s worth putting gem choices in your story, do it! Some people will get upset and some won’t but that’s honestly for anything nowadays. We all have different preferences on what we would spend gems for.
Personally, if I had the gems, I would spend it. I’ve always wanted to pick the gem choices in stories but I just never have enough gems lol.