Merging thoughts from a couple of threads here.
If wikipedia is kicking your butt, check the page that's beating you. If there's a citation needed, create it (the citation), drop it on your site, and give yourself a link from the wiki page.
The wiki page in my niche makes a claim about prices over time. No citation. I'm putting together a spreadsheet right now that will show the costs of different products over time. Surprisingly it seems no one has ever done that. Or perhaps it's not surprising. I'm going to publish it on my site, and drop myself a link from wikipedia (I think the link will stick).
I know the link is nofollowed, but I have three further points about this:
1) I suspect that having a link on a primary wikipedia page may get you some backfill links from other sites. Perhaps others can confirm?
2) The early results of my study are astonishing. In some areas they contradict everything I 'know' and the way I sell product. So point #2, I'm pretty certainly going to be doing a press release in conjunction with this. Creating the information for the citation in wikipedia has provided some newsworthy information.
3) I'm also going to forward this to bloggers in my niche, and some celebrities. May get some more traction from this than I'd imagined.
I'm going to have to review some related wikipedia pages for more unsubstantiated claims, see if I can prove them wrong or right.