My opinion is, if you enjoy it, does it really matter if you make the same quilt over and over? Nope.
A couple of times, I've made a quilt more than once. The Turning Twenty is a really fast, TNT pattern, and it looks different each time I make it with new fabrics. I made a "tissue box" quilt twice in different colorways. And I'm working on my second churn dash quilt because my daughter saw the first and wanted her wedding quilt to be the same pattern, different fabrics.
My motto is, As long as it's not illegal, immoral or unethical, and making multiples of the same quilt pattern is none of those, so go for it!