I think there are several reasons that suggest developing robots is a waste of money.
In San Diego recently $325,000 was spent on inventing a robotic squirrel to do some scientific experiments. The research proved that squirrels are able to scare away snakes by wagging (摇动) their tails. Do you need a robotic squirrel to work this out?
What about AIBO, a robotic pet, developed in Japan? In Japanese aibou means “buddy”. These pets have been developed at huge cost mainly to provide entertainment. They've been used in movies and music videos. Universities have used them for educational purposes. However, in 2006 the company stopped producing these robotic pets in order to save money. Was it worth a lot of money?
Then there's NAO, a robot which has been developed by a French company. Its main purpose is to make life easier for humans. It speaks 19 languages and has its own personality. It can tell children a story, help in the classroom or the home, or act as a companion to those people who need someone to be with. A fully developed one costs $16,000. Is that value for money? Who can afford it anyway?
There may be good reasons why it is worth developing robots, but so far I haven't thought of any.