That's great, and I'll never say you shouldn't be able to buy and own what you want. That's not the point I'm trying to make at all. When I say a waste, I mean the extra money spent could go towards more ammo, a good holster, proper shooting glasses, things that will give you a measurable improvement on your shooting or scores or times, etc.
Unless of course, shooting well doesn't mean much to you, and it's more about looks and having cool stuff hanging on your gun. Then go all out and buy tritium sights that you'll most likely never use except when you admire them going into the dark safe or cabinet when you put your guns away.
But, just so the OP knows, the Glock night sights have a much better warranty on the tritium than trijicon does, and for less money, they glow just and bright.
Some would say owning a $7500 SR-25 is a waste as well, but Questar has no problem selling the few he's been able to bring in.
ps: while trijicons may be great 'fighting' sights suitable for a working gun, there are better options out there for target or action shooting such as IPSC and IDPA.