Hello Mark,
1. DotNetNuke can be scaled out using it's support for webfarms and caching providers, so given the right hardware should support any load. Please note, 7000 sessions is a large figure, given a "think time" of 30 seconds thats ~233 pages a second. Taking the day as 20 hours (which is a typical value for estimations), that translates as 16,800,000 pages a day, which is a pretty subtantial site - and one I'd suggest you'd need to do plenty of load testing on before deciding on final software and hardware choices.

2. there is extensive logging in dotnetnuke, please see the admin->event viewer, you can enable and disable events as required.

3. not that I know of - could you give an example of one in another product - most i've seen are localized to a region i.e. a zipcode lookup for us, and postcode for uk

4. not really, there is a single paypal setup in the core, but it's not swappable - it's easy to code your own though (and add it as part of your module)

5.can't really help you with this - perhaps others can

Finally, as a note, it's often better to ask one or two questions, rather than a whole series - people often avoid threads where theres too many questions.

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