You can only extend it for 30 days and
I think they haven't focused on the snowbird issued because they are very happy collecting their overstay fees.The number of people that overstay is insignificant compared to the revenue being lost just in Punta Cana or just from the Cruise industry. Millions of entry and exit fees for those tourists versus a few thousand overstay fees. It is no wonder they have not focused much on the snowbird issue.