p.s. in post scriptum I want to admit my respect to mods of these forums. You guys rock!
They do? What do they listen to or play?
On topic again (hello again Mods), I think, as others have said, that any buyer in any scenario should research a little before committing to their purchase. You wouldn't commit to a £200 purchase in any situation without first checking what you're going to get or what its pros and cons are.
I spent weeks reading reviews, checking manuals online, test driving and doing all sorts of research before checking deals and battering dealers down before signing on the dotted line to order a new car recently. I would apply a similar (but proportional) level of research/check on any new item e.g. Tablet, Phone, Computer, Saitek X52 Pro, or whatever) before committing to purchase.
Admittedly the checking of product quality is not open in the case of the Alpha as it's a new product, however there have been plenty of reviews and videos showing what the product does and what it doesn't yet do. In the Alpha checking what is/isn't available is an available option. If the store or, in my earlier example, the Car Dealership, wasn't clear (whichever vendor you are talking about) you ask someone who knows, they will always be happy to help you wherever you are and whatever you're buying so you can make an informed decision/choice.
For myself I think that the Alpha is excellent and for me is good value. However I mainly backed for the pleasure of seeing the game being made. The fact that it is so good at such an early stage is a massive bonus.
The phrase that first came to mind when i read the OP was 'caveat emptor'... It's a very good phrase to keep in mind, never buy until you have peace of mind on what you're getting; not doing this is called gambling which is what many of us who backed in the Kickstarter at the beginning did... For us it was a leap of faith that, happily, was rewarded with a successful outcome; not all gambles do.