My buddy Jeff used to kick off the bottom every single time we hit the pool. I swear his fins would scrape the tiles and he'd still be doing it 10 feet later. Its like you're trying to tell the fish you're coming and you want them to scatter. Just glide a little and save yourself the energy, man. Plus, it messes up the bottom and stirs up all the silt. Not exactly the best way to sneak up on anything.
Ran into a guy once who was convinced he had to kick off the bottom at every single rock pile. He'd sink down, bang his fins on the bottom, and then shoot up like a rocket. All it did was throw a ton of silt and scare off every fish in a 20 foot radius. Drove me nuts watching him do it for a whole dive.