I'm definitely not planning on promoting it here without asking, Sharp runs a really great site here and he has a few sensible rules that I intend to follow.
Right now we're not even near to having anything ready to sell, so I'm just looking for input, good ideas, wacky ideas, suggestions, do's and don'ts. So your advice is also very welcome, thanks.
All in all it's pretty interesting to see the diversity of opinion

I don't think many people are "against" it, it just seems there are a lot of different ideas on how to go about it.
Maybe I shouldn't have started by saying we want to sell it, because I don't want to focus on that too much. We will put some price on it at the end, probably based on the competition and what we think people might reasonably pay for something like that. I can't imagine what we'd have to charge if we were counting hours and gear

I just get a kick out of the idea of creating something good that people can buy. It'll be pretty hard to compete with some of the excellent free stuff! But I hope we will be able to make something that stands out, or at least fills a niche.