I have several domains, each with hundreds of pages listed in google, but
the traffic is low, those are nontargeted cloacked doorways ... pure spam 
and I would like to use these domains for new, better optimized pages, cuz they are all PR5+ 
now can I delete those pages and via .htaccess redirect
all traffic to the root?
will it hurt my PR or will google penalize my domains for it?
what do you think?