They tend not to know of the foreskin's function. Many circumcised men are unwilling to subject their penises to a knife again. The main advantage of surgery over tissue expansion is that results are quick. The kind of restoration favoured by most restoring men is stimulated growth by tension . It differs from stretching, because new skin and mucosa are caused to grow.
Results are slow but much cheaper and more likely to be satisfactory than surgery.
Part of the satisfaction comes doing it for yourself. Part comes from taking charge of a part of your life that was stolen from you. The process involves attaching something, such as a cylinder of surgical tape, to the shaft skin and pulling it gently forward, until evenutally it covers the glans full time. This has been known to occur within 18 months, but some men take much longer. This is wrapped around the penis, and the upright of the T is folded forward and attached to elastic .