I have 27 sites with adsence practically all self ran by them self's or other people managing them for me .
One major site (which makes practically all of our adsense/affiliate income) and a few state related (Australian) off shoot sub domains, mostly still in development, plus a couple of others. Also a blog, though I haven't posted on that in a while.
Most of my sites are either Adsense or Paypal didgital goods. I use a reseller account to host all my websites and the Adsense revenue pays the monthly hosting fee, leaving the Paypal money to spend on website services. I am working on a 3 year plan, will probably take 5 years. Us musicians dont get pensions, so Auto money is my pension! Its not really hard work, link all of your websites together and advertise only a couple with the chance that visitors of the advertised websites will visit your other ones, should they see something they like. I do a website submission using IPB9 every month to 100+ engines and thats about it really. Word of mouth, email lists, friends etc, all the best viral advertising.
great your sites is so many, i don't know how you can mangage all of your sites, i think you must a em[ployers. isn't ? i currently only have two blogs. this is make me busy.
i have 2 personal & 1 free hosted. - steelit.org - interactive webdesings - started 6 months ago. - warrock-hacks.com - started 2 weeks ago. - counterstrikehacks.uni.cc - free hosted