There comes a time in every stock's life when it must grow up and bite the bullet of adulthood. That's not to say the company won't continue to grow, or that the stock should be sold. In fact, there might be decades of respectable growth ahead, but the days of huge earnings growth are probably over.
This "adulthood" stage usually is accompanied by the decision to pay a dividend to reward shareholders. It seems like this is exactly where eBay is at today.