I'm very pleased that both FOTA and GOTSG give Gems, I'd wager that we all have the odd 1 or 2 of those truly wonderful items hanging around doing nothing.
Also, why complain about something which to our advantage? That's nearly as foolish as the idiots who bragged about the FP "loophole" in Vikings; take the money and run, make hay while the sun shines because if enough Players make a noise about it Inno will cut off our free Gem source from what are essentially useless items.
No kidding!
Those otherwise pointless FotA's & GotSG's are finally useful, and will still take me a month or more just to be rid of my current stash of HMA ones! (which gets further ganked by the fact I win more of the blighters every damn week!)
As for why the WW gives fewer gemstones vs. the FoY? Probably because the Fountain is much, much rarer to obtain is my guess...
We're getting at least a WW or two in every single event now automatically through the 'Grand Prize' systems, plus they show up as daily specials, and/or as daily challenge rewards to boot.
On the other hand, the FoY is locked to GE, and can only be obtained via:
a) 10% chance when it occasionally spawns in the 48th chest
b) 50% chance when it occasionally spawns in the 64th chest
c) potential Jade relic prize, which itself is rare outside of a high-leveled ToR
Sure the chance is technically there every single week, but really, I win waaaaaaaaaay more WW's without even trying for them, than I do FoY's despite playing through GE every single week.