I can answer that:
PMing someone for help and rescue/pay money for freedom, it isnt against RP.
Commiting suicide if you dont want to be a hostage? Ok...
If IRL you are kidnapped and you dont want to be hostage, will you suicide IRL? If you arent that much dumbass, i guess you wont, because your life is worthy, and if the kidnappers demand N- ammount of cash, what would you want to happen? That someone pays cash or kidnappers let you free huh?
Well, with that explanation, RP with that, if you commit suicide while being a hostage, you can be reported for non-rp and that is kickable.
Maybe you ask: If i try to escape? Its the same answer as the "Commiting suicide", because for me, escaping is suicidal, except the kidnappers are unarmed...