Tommy Lee Jones. That's why.
:supergrin: "Get yourself a Glock, and get rid of that nickel plated sissy pistol..."!
I am not opposed to a variety of finishes, but I just don't see the need. To each their own, though. It isn't necessarily a bad thing.
I don't use coasters to protect my picnic table from a wet beer can, go get exfoliation/pedicure for my face/nails, put bows in my dog's hair, or launder my work gloves to keep them looking clean.
Some might think those things would make (my table/me/my dog/my gloves) look better, but it seems like a waste of time and money to me. They make me happy the way they are! Ready to go, no fuss or frills!
If you like the look of nickel gun (I do... just not on my Glock's), have fun! Do it! Get it done the way you want it. I can't imagine it causing any issues.
I think that many people just view their Glock's the way I do. As a reliable workhorse. Perhaps not the prettiest dog in the kennel, but a good, reliable, loyal, old friend!