No.

Seat belts are not only for crashes. I have about 1.3m butt in seat flight miles after having a "different place anywhere in the world every week" job for 10 years.

Turbulence can be scary stuff. I don't fly without buckling the seat belt. Even with the seat belt sign off.

If you're wondering about the frequency of turbulence injuring someone, monitor this site for a week or so:

http://avherald.com/

Accident: Westjet B737 near Calgary on Nov 5th 2012, turbulence injures flight attendant

Some days/weeks it's very frequent.

I just wouldn't take the chance.

BB