I'd genuinely like to know (and I promise that I'm not going for a vi/emacs discussion), why don't more people use KeePass? Specific to asking you, did you know about KeePass and, if you did know, what turned you away from it? It is both open source and free and, from what I've seen, has a good number of clients.
Maybe I'm barking up the wrong tree and the marketing or brand awareness of LastPass and 1Password is much higher than I suspect.
KeePass needs better cross-platform support. The Mono/Winforms experience on Linux is not a good one. Keepass2Android on the other hand is fantastic, and I'd argue a bit better then the original (out of the box support for common cloud services).
What we're really missing is out of the box support for something like BitTorrent sync, so you don't need to centralize your store anywhere else.
Maybe I'm barking up the wrong tree and the marketing or brand awareness of LastPass and 1Password is much higher than I suspect.