I wanted to share this reply from John Peters of /www.bicycletest.com.:
"It seems to me that you can pedal your bike fine, so why spend the money at all? What is silly money? That definition depends on how much you make. You seem to have answered your own question by stating that your friends campy pedals are smoother in and out. So if that’s what you want, buy the campy pedals or learn how to trackstand at lights so in/out is less of an issue.
Are the Campy or Shimano pedals better? I would say yes. Should you spend the money, well that’s ultimately up to you. Like I said, the Wellgo’s aren’t keeping you from riding your bike. If money is a big issue just keep the ones you have. It’s the law of diminishing returns. A pedal that cost twice as much is maybe only ¼ better that the other."