Using this (uniquely written article+contextual links) model at Ask Directory for approximately one 1 year.
I'm with centime on this one: it seems like more effort than usual for the submitter. I may have misunderstood what you mean by this though, and that's another potential problem. The more options you add, the more you run the risk of baffling submitters. For instance, it has to be really clear who is going to write the article. It's definitely better to have links on a page with lots of unique and relevant text, but when you want to submit to several directories, all with deeplinks, it can take a while and the easier the process is the better.
The problem is whether to allow articles or not! I have made some modifications to PHPLD3.2 so that users can submit articles along with a listing. If I keep article then I have to add more pricing options to it . and also there would be more problems. That's what my question is.