It's a niche market, which is why the blade choice is limited.
They are more difficult to make, which is why they are more expensive. Feel free to stick some LED's on a normal set of blades and make your own (I've done it, its pretty tedious and I wouldn't bother doing it again unless it was for a specific colour scheme I wanted)

I wish the take up for night flying was bigger too. I guess there's a number of reasons why not many people do it. For me in Canberra, it's only warm enough to do it through summer. For the guys in SE Asia, they tell me they get eaten alive by mosquitos at night so they try to avoid being out at the field at that time. Each to their own really.

 

@timmy here in melbourne, at night time its mostly perfect! blows its guts out during the day but pretty much calm most nights.. Well that's the way it seems. Im sure if i buy some blades storm heligod will make sure that its never calm at night... lol