Couple of things. No, there is no video clip of me shaking my head and body in a John Travolta stylee. It could be arranged for a price.
Second, value for money is more complex than 'this is a torch'. If you look at the Nao, there's a fair bit going on. For starters, it's rechargeable, which very few outdoors torches on the market are. It's also programmable, via Petzl's own software and a USB socket. Then there's the reactive lighting - it's undoubtedly very clever, whether it's worth it for your particular useage is another question, but for some people it will be really useful. Ergonomics? Feels extremely stable and comfortable and well made.
Value for money is a really hard one with outdoor kit. One person's value for money is another person's pointlessly expensive luxury buy. Say you're planning to sleep at 8,000 metres on Everest, a sleeping bag costing £1,000 might be the best investment you ever made. If, on the other hand, you simply want to stay warm in the Lakes, it would be absurdly overpriced. Same bag, different end user, different value for money.
Oh, and the Gamma, while it's an excellent budget torch and I use one myself, is clearly a lightly customised off the shelf unit. I've seen two near identical models from other brands. I've also managed to break one in long term use. I've never managed to break a Petzl. I think it's a bit of an apple versus oranges scenario tbh.