Oh how times have changed...
I've BOUGHT albums based on cool name alone (well... that and album art), mainly because I had no other option to find out what the material sounded like. Albums like...
Meantime by Helmet
Superunknown by Soundgarden (though this one was only because my house didn't yet have cable tv in 1994)
Dopes to Infinity by Monster Magnet
La Sexorcisto Devil Music Volume 1 by White Zombie
Now as for having checked out (read: downloaded) albums in the mp3-age solely based on name, you might as well be asking how many people undo their pants before using the toilet.