Yeah its worth a shot. You can even later rotate your domains. I mean, get a 100 domains indexed etc, then if you feel some of them don't perform well, get in another batch while you move out the other non performing indexed domains to parking ... so there is no limit to how many domains you can actually play around with.
This would be awesome if you have a typein domain which gets great traffic, but low CPC's and CTR. With WP, you would now have articles on your keyword which would attract a visitor to stay on and read, rather than just move out in a second. And if you have good ad placements, there's a lot of money to be made. Atleast, the money is all yours and every extra bit of effort you make in adding value to your high performing domains will yield you rich dividends.
You can use YPN, AdSense, AdBrite, Chitika, Bidvertiser, CJ, Click Bank, Auction Ads and just so many unbelievable options. But the only thing to remember is, its not that you just add the keyword, place your ad code and start seeing the profits roll in (unless, you already have a traffic generating domain) ... its gonna take time for your site to get indexed and visitors to start visiting. Also, your ad placements matter. It needs a bit of some personal effort too. Try adding some new articles of your own, if possible, and you will even end up getting a good PR.