Folks who know they will keep their rig and keep going to Mexico will gradually realize a monetary advantage, small though it may be. For instance, we have gone to Mexico eight times since getting the ten year permit the beginning of December, 2005. Since then we have traveled on that initial TIP, which cost then about 55 dollars. Had I returned it every year on leaving the country my returning cost for all Ten Year TIP's would have been nearly 450 dollars. During that time I've changed the windshield twice, each time transferring the same sticker. Of course, I have no way of knowing whether the cost of the RV TIP has changed during that time.