I read the link (yes, I did :)) and I was reading about learning disabilities, not ADD. I've had experience with ADD in the family and have never, ever heard of anyone being offered anything, including IEPs, much less SSI.
I will say, though, that we're starting to work with a family that seems a bit too invested in their children having problems. This is just only after a 1-hour observation, so probably not fair quite yet, but we'll be working with them a lot more in the future and will have a better chance to assess it.
As always, I say fix the system rather than trash the whole thing. People should not have to choose between their children doing well academically and putting food on the table. And our help should always aim at getting people independent of it.