@Eronautics It's up to you. We don't require any regular uploads, etc. It's more like tips from your fans. You may set up your own rules, and what you'll post/provide to the supporters.
There's an option when adding the blog post named "Access Level". So, basically, any post (with/without a poll, with/without attachments) might be set to get visible to your supporters of a certain level only.
The subscriptions get linked to the artist, so, supporters of other artists won't access your posts unless they start to support you as well. Also, supporters might upgrade their level type at any moment. For example, if your Rookie Supporter wants to access contents for Master Supporters, he might do it in one click.