1) The problem → On signup I need my users need to enter the amount of properties they have.

Example: Membership plan is $5/month per property.

They input number of properties on signup and price adjusts accordingly.

2) Why is this important → This is the most effective way for me to price/sell my products.

3) What's your plan B → Create "bundle" memberships, change my pricing model, or use another service.

4) Possible solutions we could build for you → Let me enable a quantity selector in the checkout and profile so members can easily adjust their purchase. The quantity should be part of the signup/renewal payload. Would allow a developer to build "credits" system.