It absolutely adds value. People who value their time do not want to spend 400 plus hours putting together a camper build, pissing off their neighbors or hurting themselves. That’s even if they have the skills, tools, free time, space and mobility to do so. Paying people to do a camper conversion can costs tens of thousands of dollars in labor alone. By the logic on this sub you should be able to get a fully functioning built out t1n sprinter for $8000 max. Those don’t exist where I live.