Agreed. I would argue the SSL tax on servers is fairly negligible in this day and age.

As for other reasons:

1. It leaves a bad taste in your customers' mouth. Security should be an option.

2. Imagine the disaster if someone makes front-page on HN complaining how their PW got snooped and their top-secret project plan is now public.

Pay-for-SSL was a bad idea back in 2005 - now it's a non-starter in my opinion.