This is probably why we don't see it that often:
Professional Application Required
LumiLor requires professional application, either via automated spray equipment or by a skilled painter. While it is not intrinsically difficult to apply LumiLor, it does require the applicator posses a set of skills and knowledge that are unique to the LumiLor process itself to assure optimum results. For that reason, Darkside Scientific™ and LumiLor Laboratories™ require personnel that professionally apply LumiLor go through a training and certification program. Darkside Scientific™ can also provide consultants to help configure automated painting facilities to use LumiLor.
So not only would you be paying for the materials and the skill, but the Cert as well. Of course I doubt there are many painters out there who'd be will to go through the training.