There are a few incentives to register:
A donation of $8, via Paypal to firstname.lastname@example.org
Some players may find that their status becomes "Half-registered" without explanation. What this means is that I've noticed your good behaviour (perhaps because of your signing up several new players, or just your playing particularly interestingly or good discussion on the Mailing List) and decided to reward it. When half-registered, you are able to participate in more than three games like a registered player, but you still get banner ads.
If you want to send comments, suggestions or bug reports, send them to email@example.com.
If you want to send Precious Things, email me info first, and I'll give you my address if your Precious Thing is appropriate.