I don't know. I have a few, as well, and I like them. Also, just a nice way to support a project you like to use, and allow them to finance a free service for other people and stabilize their revenues.
We're going for the feature subscription thing, over a relay subscription. (Being whitelisted on theforest relay will open up additional functionality or services, and access to additional private relays.)
1. Offering hosting and computation services makes sense both for monetization and for providing a reliable product/experience
2. Pay-per-use of those services makes you more adaptive in a highly competitive market. Nothing stopping you from offering pre-paid bundles.