Unless you can show up for EVERY date looking like you do in professional/glamour pics, don't waste the money. It is not an investment when the photographer air brushes you to make you look like Cindy Crawford then you show up and your date thinks you look like Joan Crawford.
Lately, I've been more willing to give girls who use cell phone pics a chance. For the most part, these girls are more real and give me a better idea of what to "expect" when one walks in the door.
My advice would be to forgo the pro pics. If you want something a little more "staged" then say the ubiquitous cell phone pic taken in a mirror, get a regular digital camera and have a friend do a photo shoot where you can model they way you see fit but still have a little control over the ambiance.