Hey genius, once a complaint is filed, the defendant actually has to hire an attorney to defend himself against it. And just in case you aren't aware, attorneys don't come cheap. Motions to dismiss cost money and if you are dealing with a notice pleading state, which most states are, complaints generally get past the dismissal stage and then you have to start spending real money to defend against the case.
I think you are generally aware of this but are just playing stupid because it suits your position on shifting the burden to defendants in libel case.