Roomster is missing two simple things from their advice...

Roomster quote:

"This member may now be a Roomster sucess story... and you can too!

Here are some tips to better your chances of making a connection:
1. Improve your profile, especially your essays. Add new details to your essays and be sure to give specific examples. such as "I need a roommate because I just moved to town and I want to meet new people."

2. Personalize your emails. This makes a much better impression. Explain why you thought that person would make a great roommate and you’re way more than likely to get a positive response.

3. Send interests to anyone you think would be a good match. We suggest searching daily for new members & Hot Listing your favorites."

...

What it's missing:

'4. Mass advertise like a %#$@&^% madman and sell everyone non-stop several hours a day.

5. Craigslist pwns our website.'