Hmmm, I must be doing something wrong, as usual. Flown WT+ 4 times and only been upgraded once. But I'm off to Singapore (and back) in August in WT+, so perhaps we'll get upgrades then.
That said, I'm getting too old and picky to "make do" with Economy, and am not rich enough to afford J.
Apart from what others have already posted, which is accurate enough, my view of the typical passenger in WT+, is they are middle-aged, middle-class and middle-of-the-road - much like me.
Along with the QP life membership, it makes the trips (and the cost) bearable.