Come on guys, AG is just the tip of the iceberg if you're going for control. That's why I bought 30 acres of farmland and a malt house so I can grow my own barley and hops and malt my own grains. Of course, I didn't do something silly like buy all that land in one place. No, I bought it in 1-2 acre parcels distributed around the world. This way I can control every variable....
What's my point? There's a spectrum of control. All grain doesn't really give you complete control, it just opens more variables. Whether it's worth the extra expense (up front for equipment, on-going for time if you consider a longer brew to be a cost) is going to vary from brewer to brewer. There's no automatic reason why an experienced brewer is going to want to switch to AG. If they're able to obtain the results they want from extracts and they can afford to pay someone else to do the extracting, they'd be silly to add complexity.
Heck, not everyone enjoys DIY to the degree you see on here. If you can buy the beer you want, there's no reason to even bother with any of this unless you enjoy the activity itself.
And I can't resist commenting on the time=money business. This is true in some senses, but remember that money is not an end in itself. It is a proxy for accounting for scarce resources. The money is worthless---the value comes from what you exchange it for.
Time is also peculiar in that, while it's scarce, it's also ephemeral. You cannot store it for later use. This changes the economics considerably. If you insist on counting it in dollars, the only way to do this is in terms of opportunity costs. That is, the dollar value you assign is relative, not absolute. You can only compare the "costs" against alternative uses of that time.