AquaeAtrae wrote: "The power of CBSubs allows you to support almost any imaginable subscription scenario, simple or complex."

The above statement is encouraging. I'm looking for a solution for a more complex membership system. I'd like to understand how CBSubs might handle this scenario.

The organization manages access to an environmentally sensitive natural space. Demand always exceeds the limited accommodations which can be reserved in advance. As an effective and ongoing incentive, higher membership levels offer the benefit of earlier advance reservations (1 month out, 2 months, etc).

The challenge: Each household's membership level is determined by cumulative donations, the benefit of each lasting 12 months. Additional donations are accepted any time of year, immediately increasing member benefits. The cumulative benefits of these overlapping donations last only until the earlier donation expires. The attached illustrates this overlapping for just 9 months.