In the 60's, my uncle own a new Cadillac every year. He'd trade them every in October want the next year models came out. He'd claimed that he didn't have any maintenance or state inspection. So he said that it wasn't that expensive. In those days Cadillac had good resale value.
Dig those crazy same-age pop-art curtain at the beginning!!! Had a handfull of Cadillacs from '58-'65. Though elements of the '57 design were great, '57s were the only year I thought looked the least cohesive.