Seems like an awesome machine. It's everything people have been shouting about wanting, and now that, what was wanted has arrived, I hear people crying about the price. The price isn't bad in my opinion. If I made my green on computing power, it would be trivial even.
It's more than I personally need, but many ACTUAL PRO's do need this kind of power, and will gladly pay the price. Seriously, my MP51 cost me well over $3K in 2013 (Yes, I bought brand new, Mid-2012 MP51 in 2013) and it's been worth every penny to me. I've invested just as much or more in various upgrades over the years, with no regrets. If my current MP weren't up to the tasks I throw at it now, I'd have no qualms about buying the 7,1 base model (well, I might upgrade something on it, so it might not be EXACTLY base). Given the technology upgrades over the 5,1, and the potential upgrades over it's own base, it's a good deal (in my opinion).
If you need to upgrade your current machine, but don't want (or need) this much machine, there are other options. Let's face it. Apple is finally bringing a heavy-hitter up to bat, and if you want him on your team, you have to pay for his abilities.