Its hard to fined a place that will let you have 4 separate sites in one plan...too many people would take advantage of it.  Due to you have resale the space without paying more.  I know this due to i had people do it to me when they got one plan for $11/month and they had 15 site on it.  Most hosting companies don't make much from hosting due to there is allot of competition out there like godaddy and others.

 One thing I dont understand is that PowerDNN is sooooo expensive for storage.  They are charging 10 cents per megabyte. Thats $10 per gig per month.  Thats big bucks for storage. 

I really think its time for them to bump that plan up. Should be 10G minimum for the base hosting. I love powerDNN but this storage is killing me. I am actively trying to find something else for my new sites until this is better.  I have heard good things about Arvixe hosting.