Our Nallo 3GT
seven hundred pounds!! oh my gosh I had no idea tents could cost that much.
They don't need to. Check out Decathlon - good, lightweight tents at a fraction of the cost. You can even buy on-line now.
It's a bit like bikes really. There is cheap, there is light, there is quality, but there is not cheap lightweight quality tents. ...
As ever, it really depends on what you're doing. I've got several bikes which cost well over £1000 even before I started buying extra bits for them (and I know there are plenty of people on here who've spent a lot more on bikes), and I've got one which cost me £69 from Decathlon.
Having said that, my cheapest tent was £250, and is a small one man tent which I got when it was on special offer (it's current full price is close to £400), but there's plenty of room for things like cheap tents so long as you don't expect them to be light, well designed, rugged and long lasting. There's a reason that they're cheap! They'll often be fine for car camping, use during the warmer summer months, or using with kids (who are not likely to treat a several hundred pound tent like you and I would!)
Really, it's horses for courses. Of course there will be exceptions, and sometimes you'll find a fine cheap, lightweight tent that lasts a lifetime, but I'd suggest that mostly you get what you pay for.