Just think: when you do a Google search and you have a bunch of possible links to click on, which one do you choose?
I, for instance, when looking for new webdesign solutions, try not to click on forum websites and instead prefer blogs or online magazine’s websites. Also, if a weird URL appeared, I certainly wouldn’t click on it, or else if I hadn’t this “defense” I’d spend much more time searching the web.
Here’s an article about it, and a quote:
We found that searchers are particularly interested in the URL when they are assessing the credibility of a destination. If the URL looks like garbage, people are less likely to click on that search hit. On the other hand, if the URL looks like the page will address the user’s question, they are more likely to click.