For the people who are paying attention, 80-90% of GSE loans are already eligible for something other than a full appraisal. The only reason waivers, PDCs, hybrids, etc. aren't dominating the market is because most lender policy and systems are stuck in the 1990s. Go ahead and "more than double" your fees or spend so much time on site that homeowners start to complain, this is America you are free to do so. But don't expect it to happen in a vacuum and don't expect lenders to just lay down and accept that pain point.