I played for about the first 3-4 months before they started adding random shit, trying to nickle and dime you for everything.

they still doing that?

just got the humble bundle, wondering if I should expect a billion more small fees

humble bundle comes with all the dlcs so you're set to go. They still keep releasing maps every 2 weeks or so but currently it has all been free to download. Turkeys maps/ halloween maps/ christmas maps. The amount of content you have now should keep you plenty busy as some of the newer maps are very difficulty even with end game gear