think of it like a hamburger: cost = product expense + craftstmanship/skill

mcdonald's hamburger costs $3-5 because the quality/skill is low. a stakehouse / grill costs ~$10 + because the quality / required skill is greater.

do you really know how much more it costs for the steakhouse to cook a burger vs mcdonald's? unles you work there, no. maybe the meat only costs $5 more per burger, but you'll still pay $14 for it.

it's not so much about what it's worth as a generic product, it's about what it's worth to the buyer. project1 may be more elaborate and impactful than project 2, but that doesn't mean less work went into #2.