Very, very common over here. I constantly here the hunter/jumper folks say that the horses look "underdressed" without one, so they put them on even if their horses don't need it. A running martingale would be considered unconventional, and therefore penalized, in the hunter or equitation rings. Personally, my old hunter/eq horse never wore a martigale, and I think it looks better that way.
How extremely odd...
I would NEVER put a standing martingale on a jumper, in fact I don't think I have ever used one on any of my horses... *Thinks* Nope, I haven't.
I have never understood the concept of tying the front end down, when it in fact works against the poor horse not letting it do it's job correctly.. That's when you get frustrated horses, and then more frustrated riders. And rearers..
Running martingales are quite common here, but for a true hunter trial they should be snaffle mouthed and cavasson nosebanded. A breast plate is permitted.. But that's it.
I've never been into putting loads of leather on horses just for the sake of it, my horse is a bit loony (well... I think insane is probably a better way of describing it) , but I still hack her out in an eggbutt snaffle and cavasson noseband. At least I know if she does ever get TOO much I can add something a little stronger to give me a helping hand.
The French are also obsessed with every bit and gadget that they can possibly fit onto their poor horses.. I cried when I saw a sweet little Welsh pony in an American gag snaffle with reins on the bottom rung, running and standing martingale, and breast plate!! :yikes: This pony was like a first off the lead rein and so incredibly sweet.. Makes me wonder sometimes.