Wouldn't that be closer to QF YASAs, given you'll only earn full Y (and not J) SCs when you buy a DJ Flexi fare and then upgrade? And also a lot more expensive (cash-wise at least) than a JASA. Also, can't you do exactly the same thing on QF if you want to - purchase a Flexi Saver, upgrade to J and earn full Y SCs? Not to mention you also have the option of buying Y- and upgrading on QF, which you don't have on DJ?
I can't deny the value with DJ when they have a half-price upgrades promotion, but that's obviously a short-term thing.
Note that I'm no QF fanboy, but I just can't see where DJ is coming out on top here - or am I missing something?
I would respectfully disagree - unless you need to use your points on domestic awards, you're wasting the value in your MR points redeeming them to DJ (or QF for that matter). Off the top of my head, SQ, MH and CX offer way more burn value, and are all transfer partners of MR at the same 1:1 ratio as DJ and QF.