I think they're going about it in the wrong way .. they should have skills purchaseable individualy, similar to free online games like Albatross18 and Gunbound. That way they would make more on a per skill basis and it would be cheaper for someone just looking to fill out their skill list.

There's always a market for these types of things.. $100 for a level 60 character would be cheap compared to buying an account with one on ebay (though I think powerleveling is cheaper?)

I don't think they're going to make much money with the Prophecies skills, since most people already have most of those skills.. they'd be making good money if they released a factions pack as well. Maybe 3 months after the release of an expansion would be best