This is why Y+ (at least, Qantas' version of Y+) is wonderful. You don't get the skybed or the lounge (assuming no status), but you do get a comfy seat with legroom, decent service and plenty of food and booze. All for significantly less than a J seat. If you manage to get seats in a sale - all the better!
(Typing as a convert after a fortituous plane swap moved my seat from Y to Y+ )
I love Y+ in the QF planes, traveled a number of times due to Op-Up's etc. But i have yet to see any reasonable cost for it and i figure if i am going to pay double the whY price i may as well pay triple for J if that make sense. When BA priced WT+ at a better rate i used to fly it a lot paid.
Also whY on a 3:30pm flight to Singapore that gets in at 9:30pm is a completely different proposition to the return flight that leaves at 19:45 and gets in at OMG o'clock (6am?) where if you don't sleep you day i ruined.