I have a 512GB version. The cost for that one was split between me and my brother and we both have our accounts on it. That was soon after the release and took 6 months to arrive. 2 months ago I bought a 256GB version that only I paid for so I can bring it to the dorms since I’m a college student now.
Probably not. The main benefit for the steam deck is that it is very portable. For this you sacrifice upgradeability and connectivity. The steam deck only has one usb-c port. Yeah you can expand your ports using a dock but it still isn’t as good as having a desktop computer.
If you don’t plan on making use of the portability that the steam deck provides then there probably aren’t many benefits for getting it compared to just getting a desktop pc or a laptop.