Sure, you can do more with PhotoShop, but that is a huge investment in time (both learning and using) and money, and still isn't as easy to use as Vivid-Pix.
The flip side is if you already know how to use the big guns, VP doesn't really have anything to offer. E.g. because I'm already used to the gimp's colour correction dialog, I find VP's interface rather kindergarden-ish. Sorry Rick, it's me, not your software