I've bought and sold many bikes on Craigslist also, it's great. But in addition to the above comments, don't get frustrated or even respond to low ballers.
People will often respond with: "I like bike. will you take $1500? pick up today" When you're asking $4k... Just ignore them or reply "thanks but that's too low"
As with any sale use caution and common sense; figure out what payment you're willing to accept. Cash is king generally
2008 Versys 650
Been riding 8 or 9 years, and have owned 8 or 9 bikes; its an addiction I can't quit...