Well, I said I CAN be pirate only background and rpg wise but I like Dread Pirate's skills which I view suit to pirate (and gives some options). I get my most pirate skills being Swashbuckler and Warblade only adds trick or two in combat what I can exploit and Dread Pirate other hand gives alot class features which neither cannot never give (Seamanship examply, So far only Exemplar can give bonus to certain skill checks to people around him and that is PrC too, also Steady Stance is hard to mimick whitout PrC also).
Basically said it is possible play many classes whitout ever multiclassing but PrC gives most cases nice extra tricks and also help specialize certain tasks and fields more easily. Of course hard core rogue can beat my dread pirate in skill wise but in direct combat whit no sneak attack chance rogue is quickly goner when battling on ship where I plan fight on ropes, balancing on mast or hanging upside down from a rope etc. Also Dread Pirate gets small skill bonus either diplomacy or intimidate which can help save SP and also of course if you max skill out you have bigger mod in the skill than same level rogue.
Do not take this post offensively Ruby :). I just point out that when I said 'I cannot play a pirate' meanted I could not play one in way what I wanted (which this case is means not to able use Dread Pirate PrC and I have waited to try PrC out some time).