I'm not aware of any country in the world that legally offers the "pay to stay" visa and really can't understand why they wouldn't implement this especially in poorer countries like this one.
The process is excruciatingly slow in every country I have ever tried to get a visa in. I often wonder what they are doing back there. I guess I complain too much because while I sit here bitching about visas and how they won't just give me another one a vast majority of the population of this country would stand exactly 0% chance of even getting a visa to USA at all.