The united states offers investment visas that grant "permanent residence to the individual" to anyone who invests over $1,000,000 in several industries. - http://www.uscis.gov/green-card/green-card-through-job/green...
If you've ever read some of the, frankly, heartbreaking immigration stories (e.g. families separated for sometimes tens of years). The US seems to have an undisclosed quota in certain parts of the world and a lot of people get rejected for unquantifiable reasons (and then get accepted the second time without changing their status/application). This even seems to occur on family visas which it shouldn't.
You just dismissing the entire vias struggle into living within a country for a couple of years and saying a stupid pledge is ignorant and completely out of touch with the reality for millions of poor people (and even many in the "middle class").
All I meant was that this is a far better situation than being able to straight-up buy Citizenship, say, from Malta.