Thanks for the review, but it's difficult to see how you could've come up with anything more inaccurate.
What page redirects to Paypal? The final stage of the checkout? If you've setup PayPal standard payments, then that's by design. It's supposed to direct to Paypal (that's how Paypal works).
Documentation is sketchy? There's effectively 3 or 4 pages worth of documentation on the installation page here, and a similar amount on the FAQ here. Most of the information from the handbook was distilled into those 2 sections -- and it hasn't been offered for sale for months now.
No help is offered in the support forum? Did you even look? It seems unlikely, because pretty much every post in the support threads has a reply once I see them.
As far as charging for support outside of the forums, just because this is an open source project doesn't mean I have to give away the rest of my time for free. I doubt you give away your time for free either.