Should a support incident be opened for every stack dump, or just ones that cause an outage? Assuming that the stack dump in question can't be mapped to a know issue, if a stack dump doesn't seem to cause a problem and everything is working afterwards, should a support incident be opened for it?  Or should incidents be opened only when it causes an outage or loss of functionality?
It's fairly cut and dry: If you want to actually work on the issue, collect data, uninstall/reinstall, isolate, test, potentially provide more dumps, potentially use things like appverifier and debugdiag or have a valid repro, then by all means open a ticket so it can be looked into and worked on.

If you just want to ship off a stack dump, with no other data, and have someone look at it in a vacuum, then I would not open a ticket as it'll have no traction and go nowhere. Neither party will be happy.

That's the short and sweet version.