Vantage 1.1, due out this week, will have pricing plans. Each pricing plan can have a different duration. For example, one plan can offer free listings with no end date and another plan can be $5 for 30 days. The prices and duration are completely up to you. Additionally, you will be able to assign plans to different categories, just in case you want some categories to be free and some to be paid. The variations are endless.
In the future, we will be introducing options in pricing plans that will limit the number of images for that plan.
Let us know if we can answer more questions for you. Thanks.