There is no “catch”. Our founder simply saw a huge need and a huge business opportunity available for fulfilling that need. We follow an Open Business Model and are a Co-Operative formed for the benefit of website operators. The “openness” and “co-operation” are the only catch but they are the keys that make us different.
So when it comes to “how much” does it cost then the answer lies in determining the level of participation. Free advertising means exactly that – free advertising for as long as you wish but bear in mind others who bid and pay more will be displayed ahead of your ad (but that may not be an issue if you don’t have many competitors). If you decide to bid and pay for better placement then you can mitigate the “cost” by installing our free script and possibly earning enough to partially or totally offset those costs (and maybe even profit) by becoming a member!