I can see this happening 100%. It's already kind of a thing in home renovation and construction. Some businesses will charge you a higher hourly labor rate if your materials are expensive. Installing tile or whatever should be the same labor rate, but they assume customers buying expensive materials "must be rich" and won't blink at paying more for labor, too. They don't all do this, of course, but it's something to watch out for (and one of many reasons you should always get multiple estimates from different contractors).