I think another reason is, with a weave they could do whatever the heck they want. Curl it, wear it down, cut it into layers, use cheap holding sprays with alcohol, dye it...basically abuse it all they want in the name of looking good, knowing next month they can still have healthy looking hair without split ends by just making a trip to a stylist. Their very own long hair wouldn't have been so forgiving. To keep it looking good and healthy would take a lot of work - a sacrifice they might not be willing to make.