Things you need to know about Temporary/Permanent visa regarding, and obtaining residence can be found in Yucalandia publication (along with importing of vehicles)
*I would use this article as a guide. Cozumel immigration policies may differ some.
The financial burden can be high, but may be offset by being a property owner.
Regarding the info that is floating around about mandatory CURP number. You can only acquire a CURP number if you have TEMP/PERM residence status. They are REQUIRING that you have a CURP number to register/plate a Mexican vehicle.
In addition, a CURP number is not required when buying or selling property. See Gisela Rodriguez-Attorney article; http://www.cozumella...tax-payers.html
proper attribution: YucaLandia/Surviving Yucatan.
© Steven M. Fry