This seems to be a nice service and somewhat rarely offered or popular in the past. However, making developed sites running Adsense or YPN is not the 'bed of roses' you all seem to be expecting.
Unfortunately, since the CTR is often significantly less than well optimized parked pages a developed site frequently earns less revenue than a ppc page. In addition, it appears Google and YPN eventually get to the point where they do not like so many sites from the same owner or IP address and your stats tend to decline as time goes by, though there is little evidence.
Without going into detail you can trust me on that please. However, the flip-side is a small developed site brings hope that your traffic and revenue will eventually increase as time goes by with good SEO work and SE ranking. Of course, you can also sell products/services on the site, a nice advantage.