My point was just because you can doesn't mean you should. Flying below 1000 ft is asking for trouble. Can we say "engine failure"? What's the glide ratio of a C150? How about a C172 or C182?
Which is exactly why it is illegal.
FAR 91.119
(a) Anywhere. An altitude allowing, if a power unit fails, an emergency landing without undue hazard to persons or property on the surface.