You could create base content on your standard steemit posts , for example, if you are posting photos, you could create posts using low res watermarked not for publishing versions of examples from your photo series. You could post one photo each day like that. Each post could refer to the premium content, for example being the whole series in high res raw format.
In theory the steemit reputation system, though there are flaws in it, these are more likely to result in falsely classifying someone as untrustworthy than to induce false trust at the moment I believe.
The transactions used to pay for access are. The transactions providing feedback are as well. This means your customers really must be pressed to choose a strong password. The unsalted SHA1 hash of their password will end up on the blockchain for everyone to see, so it better not be a password that is short enough to be residing in any practical SHA1 rainbow table.
Regards.