[dejan]

Yes, that is exactly how it should work. Here the price is/should be always guaranteed, as it drops with each reservation. So, there is no price for 1-10, 10-20. It always decreases proportionally.

Groupon and buywithme are cool, but centralization, just because of the purchasing model is not right iMHO. It would be much better that you have the option at the website of purchase, whether to buy now for the full price, or get in the group to buy later for a lower price. It's segmentation of the market.