My bold suggestion would be to not do what other posters are suggesting about making pricing clear and itemized. As I've said in another comment, I think this service mainly fulfills an emotional need, not a rational one (and that's not bad for a business at all), so make your customers feel luxurious. Bean counting isn't luxurious. Do exactly what you do now, just handle the request and state the price. Getting people to think about pricing by having pricing listed and itemized will just ruin the experience. Besides, people prone to bean counting will quickly figure out this isn't worth it. Don't be Amazon, don't race to the bottom. Just find a way to scale your fee estimation process to stay reasonable enough without bothering your customers with it.