The bands are not cost-effective regardless of who does them, this is one of the reasons why I stopped, and backlit were 'perfected' years ago. The last problem to be resolved was the thickness of the back-mask substrate kinking due to the circumference on the band being smaller when in situ on the reel drum, and finding the right substrate to allow light through but be inkjet printable.
It costs a LOT of money to buy the materials to make them yourself, easily in the region of over £800 in total for the necessary equipment to begin. It took me about 5 years to get photoshop to do what I wanted and learn how to use the programs needed, and to research the correct hardware necessary to print the lengths needed for bands, multiple types of paper for different types of bands, laminate sublimation roll, glues, adhesive removal, cleaning fluids etc. Then you need the correct colour profile on all hardware or the printout won't match the input artwork, each media has different print properties and colour differences are always evident (further £180 for a datacolor spyder). In man-hours it takes about a week in total from the first scan to printout (some waiting for inks to cure and gas out was involved) and it really has to be a labour of love or you'd tear your hair out and there's no way you can recoup the costs in charges on an hourly rate if you sell them. If I thought I could have chared £100 a standard set I'd be sunning myself in Miami. We live and learn. 😂