Rake Instead of Blind Increase in Tournaments

[InfernoLL]

I thought up with the idea the other day to structure a tournament with a rake instead of increasing blinds. I'm fairly new to poker so I realize this might not be a new idea. If it hasn't been tried, does anyone have any thoughts as to why it would be an especially bad idea? Such a structure could incorporate an increasing blind as well, but of course it would happen much more slowly. Thanks for the feedback.