Tim Berry compares two stock photo revenue models. They are both used by the same company.
One is a subscription model. You pay a monthly fee to use photos.
The other is a credit-based model. You buy x amount of credit which is applied when you need photos.
Neither model cannibalizes the other because each model serves different customers. They pick the payment structure that fits their needs.
Is there any way you can attract new customers by offering alternative payment structures?