To me, personally, pretty much anything that is under $2k is a throwaway if it fails and I shall not waste a lot of my time trying to get it fixed under warranty etc. And it is only in rare instances I spend time fixing stuff myself, and when I do so it is probably rather as a learning experience rather than really trying to fix something (but it's nice when the two coincide :-D).
Price is but part of the equation.
As you eluded to, what the customer is willing to do and has the capability of doing also play a significant part. For example very few people have soldering irons now days, and even fewer people have one's appropriate for working on ICs, not to mention all the other tools needed. Knowledge is also significant. This summer I came home and found my neighbor trying to replace the socket on her front walkway light post. She looked frazzled, and my wife asked me to walk over and see if she needed a hand. She had all the wires exposed, and hadn't switched the breaker off!
Size also plays a significant role. The atom 2 is I believe the exact same size as my first generation model, approximately ~38 in^3 in volume. The Yamaha mentioned above is ~2227 in^3 in volume. All that extra volume affords a lot more flexibility when it comes to design/construction/modularity ect, and has a direct relation to how fixable something is.