Maybe, but the ones in the picture clearly don't, unless they're for Willy Wonka's little orange folk. Comfort is a major factor for me (being 6'3"). It's even worse when it's busy, like at the last £5 game where the guy in front was giving evil looks because my knees go behind his seat, where he wanted to put his arm...
Anyway, I'd love to see it. Would improve the atmosphere, improve the singing and help us keep warm too. But all that metalwork would need to be designed to resist a charge, and will therefore cost a fortune compared to the flimsy stuff which sometimes holds a seat together.