why is a Northern Lite, Lance, Big Foot, Etc worth twice the price of a palomino??
There are differences in build quality, in the materials used, and in the design principles.
NL and Bigfoot are fiberglass shell campers - they are made to last longer. They may not be worth the price difference to you. Palomino campers have always been at the low end of the scale.
TC longevity and quality is a complex topic. A cheap camper, built on a good day, treated well, stored dry, and frequently maintained, may well outlive a misused high-end camper built on a Friday afternoon.
For your first TC, there is nothing wrong with buying a relatively inexpensive used unit. Go camping in it for a while, then you will know what you like about it and what needs to be different for you.