I’m only a wee little person and, well, if the 30+ odd folks clamoring for PostgreSQL support on this list each offered the same, that’s a good $750 right there — not too bad I would say. I would also think there might be more than 30 people in the world interested in PostgreSQL support.
Just want to add my vote of support for PostgreSQL, as I already use Postgres and would not like to install MySQL. I would also back up my support with a donation if there were even just a commitment (and target date) to Postgres support by the developers, of $25. I’d really love to use WordPress, but can not until it supports Postgres 100%.