The article pretty well sums it up correctly.
After buying millions of the little buggers over the years it came down to a simple form of math. It still takes 1100+ tabs = 1 pound of MLC aluminum which has a set price like aluminum plate, sheet. So it's easy to see that having a mass number of folks collecting tabs and donating them to one location then they bring the tabs to the scrap yard it does benefit a small amount. Heck it's easier to collect a couple dozen cans and get the same amount of $.
Gee wonder what would happen if folks took what they spent on sugar drinks and donated the money to the cause they believed in-it's just a thought.