I'd suggest not doing tiers. Segmentation is repulsive. Why do I ever want to be a bronze-level customer in your product world? It perhaps makes sense for products that have monopolized or established firmly or where costs are truely substantial as feature/utilization is increased. However, most likely is often the side effect of throwing in the MBA part of your brain to squeeze in that last bit of revenue juice without you having to improve the tech. In essence, just luring in customers with "low starting from..." prices and then telling them they are fools to expect those prices. I tend to distrust products that rely on segmentation to inflate revenues and I think they are often ripe for disruption. At least, for creative/educational products please don't tell your customers that they are 3rd class citizens in your world unless they allow you to completely squeeze them out.
