Maybe the price is a factor, but I suspect it's just this: there isn't much difference between a green card and citizenship. You can do "almost" everything wit

Maybe the price is a factor, but I suspect it's just this: there isn't much difference between a green card and citizenship. You can do "almost" everything with a green card that a citizen can do. The green card process is extremely long: years and years of bureaucracy, lots of forms and lawyers that cost money, and even a medical exam and fingerprints. Becoming a citizen means another form, another fee, and studying to answer questions that (if Jaywalking is any indication) natural born citizens don't even know the answers to.