I'm late to this, but I have a completely different suggestion.
How 'bout: hire someone to write really, really, REALLY good documentation. Complete, with hand-holding and tutorials and tips and everything.
To pay for this, SELL it. You'd surely get enough users (not the regulars here, most of whom don't need it, of course) to shell out, say, $25 per that you could afford to hire a really good technical writer. And even if it doesn't break even, it's worth subsidizing, since it will open up your market to less tech-oriented people.
another bonus: you could plunder some of the language to better explain functions in help files and on this site.
You could even use print-on-demand to do a bound version.
[Scream, if you want, feel free to email me and I'll help you brainstorm....and explain about print-on-demand].
