Even if it were technologically and economically feasible to capture and mine Apophis, the prices you cited wouldn't last; those prices are made considering cur

Even if it were technologically and economically feasible to capture and mine Apophis, the prices you cited wouldn't last; those prices are made considering current supply and demand; if you flood the market with that much nickel or iron, prices will drop incredibly quickly and you'll soon be left with a bum investment. It's like the proverbial "What if I found a solid gold pyramid under my house?" or whatever.