✅ Psychology
Let them build part of it and they'll value it more
People who assembled a plain IKEA storage box themselves bid about 63% more for it than people offered the same box already built. The catch: the boost vanished when builders weren’t allowed to finish, so the effort has to end in something complete. Give customers a small job they can finish, like configuring a plan or shaping the proposal, and they’ll value the result as partly theirs.