You're asking about the phrase "just because", not simply using "because" at the end of a sentence. You should edit (the title, especially) to reflect this. (Unless you can find an example of 'because at the end' that is not a 'just because'.
Usage of the phrase " just because" at the end of sentences
I just read an entry on "cross platform" from Wikipedia, in which it wrote: Just because a particular operating system may run on different computer architectures, that does not mean that the software written for that operating system will automatically work on all architectures that the operating system supports.
@Edwin: I did point out myself that just because has "peculiarities". I don't know "extragrammatical idioms", but all your examples are single self-contained phrases that don't/can't change. B&K say the “JB-X DM-Y construction combines semantic and syntactic quirks that necessitate a constructional analysis. They then show numerous variations allowed by the "grammar" of the construction ...
grammaticality - Grammar: "Just because A, doesn't mean B" - English ...
Recently, my dad bought headphones just because they were on sale. But, the thing is, none of us needed new headphones, he just got them for no other reason other than they were on sale. This isn't...
What's a word for a person who buys random things just because they're ...
If number 1 is correct, that means "not just because" is only a more emphatic version of "not because". But if number 2 is correct, does that mean "not just because" means the exact opposite (i.e. they have lost motivation, and while that partly accounts for why they aren't playing well, the other and perhaps the main reason is the absence of ...