Frans,
I've seen so many websites that use stock pictures, images that say zero about the company, it's ethos, what it does, where it does it, or how it does it and is therefore inert from a marketing perspective and is a giant 'turn off' to the prospective buyer. If your going to invest in a website why not get one that makes you stand out from the crowd and not bury you in the crowd. Marketing is about being different - just because everyone else does things a certain way doesn't mean you have to - quite the opposite, in fact.
Simon