You can certainly expect whatever you want. And you can at least hope it will be the case. But if it doesn't, you're only out a few Supersized meals at Mickey Ds. Right?
Personally, I don't have time for this sort of 'let's scrape the bottom of the pricing barrel, and hope we can uncover a diamond in it', sort of thing. But every consumer ultimately makes his own choices about what he can spend, and what his expectation is.
What I would be out of is something irreplaceable: time. That is exactly why I don't do the same thing that some other folks do; as you say: let's scrape the bottom of the pricing barrel, and hope we can uncover a diamond in it.
If something is extraordinarily inexpensive, then corners are cut somewhere (even if the wages are low).
Longevity and having a product repair/replace infrastructure costs money (as does honesty about the product that you manufacture). If that is not something being paid for upfront then it is also something that is not built into the price and it is MOST LIKELY to be minimal to non-existent.
And that is why, for example, when getting something, throw out the ridiculously high prices from consideration (because they BELIEVE that no one else can be as good or better for the same or less money. I throw out the lowest prices because I don't BELIEVE that a quality product can be built with a great [& high quality support structure] for little or nothing in financial or time resources.
That still usually leaves me with a large amount of reasonably priced, reasonably supported with quality support, that will likely be there SHOULD you need it in the future.
And that parts will likely be available for some time to come.