Hi @jasonye,
Thank you for your interest.
Could tell us what you mean by “developer purchase” option? ThemeForest offers an extended license but I’m not sure that’s what you’re referring to.
According to ThemeForest terms, the main difference is that under the Regular License, your end product (incorporating the purchased item) is distributed for free, whereas under the Extended License your end product may be sold or accessed by paying users.
Please read the following FAQ topics for more details:
https://themeforest.net/licenses/faq#main-differences-licenses-a
https://themeforest.net/licenses/faq#license-paying-users-a
https://themeforest.net/licenses/faq#faq-section-regular-and-extended-licenses
So if you will be charging your members per month, our understanding of Envato’s licensing is that it’s recommended in your case to choose the Extended License.
Best regards,