I have had problems with WhyPark.... have a bunch of sites there with unique content, plenty of links and PR that hardly rank.
It does kind of make sense for Google to penalise sits like these (even though it sucks for us).
Google know that really only domainers and web marketers use WhyPark. They are likely to be less knowledgable about the subject matter (of each individual site) than a non-techie who makes the effort to maintain a perhaps very crude blog for example.
They wouldn't necessarily just de-index a WhyPark site of course. But they might slightly weight against ranking for this reason
I think the best solution in this area is to look at blogs. After all, all sorts of people use blogger, wordpress etc so G would never throw a blanket mild penalty across all these sites.