That leaves me wondering what PowerStore actually has left to offer a web developer. One would assume that inventory control and email receipts would be an integral part of your product - given the cost - independent of the choice of payment gateway. I am finding it hard to identify any proprietary function other that providing a limited template and a UI that merely shortcuts to existing DreamWeaver or PHP functions.
Similarly, I just bought WebAssist's iRite, which "utilises FCKEditor", and it turns out that it virtually <i>is</i> FCKEditor - which I could have (and subsequently did) download for free. Are the (open source) FCKEditor team aware that you are charging for what is essentially their product?