Our average sales multiple is nearer 3x but this is still a good question.
Often businesses (especially those selling nearer 2x) are relatively young so the valuation reflects the risk.
We have a very stringent pre-listing due diligence process so while it remains the buyer's responsibility to conduct their own due diligence, none of our listings are scams.
I wrote a little more about why people sell businesses last year: https://www.linkedin.com/pulse/20141023121347-71653461-6-rea...