I wouldn't, and I'm sure you wouldn't... but there are people who do.
Case in point: OpenERP. Serious business software doing serious business things, so of course they can't use any of those other toy ORMs, they have to spend 5000 lines of code writing their own: http://bazaar.launchpad.net/~openerp/openobject-server/trunk...
I know of other projects in a similar state, but they're smaller teams or solo coders, so I don't know that they're quite as fair game for finger pointing...
Case in point: OpenERP. Serious business software doing serious business things, so of course they can't use any of those other toy ORMs, they have to spend 5000 lines of code writing their own: http://bazaar.launchpad.net/~openerp/openobject-server/trunk...
Hey, it might not be so great, but at least they have tests for all of that code: http://bazaar.launchpad.net/~openerp/openobject-server/trunk...
Er...
I know of other projects in a similar state, but they're smaller teams or solo coders, so I don't know that they're quite as fair game for finger pointing...