In short, yes you can make money with WordPress. If you spend a lot of time writing and devote a lot of time marketing, getting back links, and basically spreading the word about your blog. Blogging is a hard process to make money, but it is very possible to do so. There are many people with very successful WordPress blogs that make hundreds, if not thousands a month on their blog via promotional ads and affiliate links and other methods of revenue earning potential. I would not recommend that you quit your day job because blogging is a very variable area to earn money, but it can be a good supplemental income for you.