Apparently the US has bought about all the V22's it wants. To keep the Boeing production line open, and all the workers employed, Boeing is looking to sell the V22 tiltrotor to any foreign country with money. A lot of money, V22 is expensive. Much more expensive than helicopters.
According to Aviation Week, notes that "V-22's ship board accoutrements- including folding wings and electro magnetic hardening- account for nearly half the cost." Wow.
And "A particular headache for the V-22 has been engine on wing time, now averaging 100-200 hours in the harsh conditions of Afghanistan" Double wow. J-75 fighter plane engines gave 1000 hour service back in the 1960's.
Boeing has an expensive-to-buy and expensive-to-fly machine here. Good luck finding customers for it.