Wow. £2k! Bit steep for me.
Ben, same as with fly rods I guess. The very very best may give you what, +5-10% performance for say 4-5 times the price. It's a personal choice as to whether it's worth it.
I doubt anyone buying this vice will expect their flies to turn out three times better than their £650 quid one. They'll be splurging because, (1) it looks great (2) it feels great, and (3) it says something about their seriousness as a fly tyer and (4) any of a thousand other emotional responses that make us buy things we don't really need but can easily afford.
Will