For the same price, you’re much better off with Multicharts, which is 100% broker and data vendor independent. Why get hostaged into NT brokerage? Makes no sense. That’s a horrible business model which will lead to their demise, as competing and open source platforms aim to offer flexibility.
I think you're right and that this was a very bad decision on NTs end. I briefly tried SC since I wanted to use another brokerage and not be dependent on NT brokerage, but didn't like the platform and decided I didn't want to deal with having to learn a new platform right now. Multicharts was an option, but I had a lot of stuff already coded in NT.
I heard some rumors directly from NT that they might open up for other brokers this year and I sincerely hope that to be true.
As for cost, $1000 is a bargain, but I can understand how it's a big investment for some people starting out. But I guess the truth is that if you can't afford the software, you're most likely undercapitalized anyway.
Alternatives:
1) Lease NT quarterly - More expensive in the long run, but less here and now.
2) Continue using NT for free and use it for charting, but execute through some other software if you use another broker such as AMP.
I considered this latter option because because of reasons mentioned above and since I already use IQ Feed for charting anyway, but for now I decided to try NT Brokerage for a while...