I have noticed a couple of things over the years in this business.
Some people change their minds frequently. I regularly have orders placed by folks followed by changes in which handgun it is to be made for, or which holster model they want, not to mention all the changes in colors and options. Customers regularly order a holster for one handgun, then notify me they have traded guns and need the holster made for something else. Some folks seem to change sidearms the way others change socks.
The other thing I see regularly is holsters that I made quite recently showing up on eBay or in the forum ads. This includes holsters with any number of options chosen by the original customer to suit individual preferences. Why they are selling the holsters may not be known, but I suspect that most have sold or traded the handgun and no longer need the holster.
On the other hand I know of several holsters that I made back in the 1970's that are still in use by the original owners. Made one for a friend on the police department as a gift when he was promoted in 1976, and he still uses it. Another was made as a retirement present about 1980, and the last time I ran into the recipient (about 2004) he opened his jacket and showed me that holster on his belt.
Some people find a handgun that suits their needs and a holster that works for them and stick with them for years. Others keep trying something different over and over again.
I won't complain. Last time I sat down and tallied up a year's orders I noted that nearly 30% of all orders were repeat customers. That tells me I must be doing some things right.
Best regards.