You should maybe charge more than you think. Even if you’re committing to a few extra videos/posts/photos per month, having paying members takes extra work that is hard to account for. You should be compensated for that.
It’s rare for a member to convert from a lower tier to a higher tier. In most cases, it’s not worth it to have a way for people to pay you $2, $10, $50, in hopes that they’ll upgrade. If they’re happy with the $2 they’ll stay there. If they’re unhappy, they’re more likely to churn than upgrade.
To me, a membership is something you pay for to get access to a benefit you’re after. That benefit can be a community of your peers, but it doesn’t have to be. For example, you might have a Costco membership, which gives you access to the store, but there’s no Costco community.