Dying instead of relogging after a finished run (perhaps using the Select Server option is faster for you. My comp is not that fast). Remove all unnecessary stuff from your inventory like potions, costumes to maximise your profit.
It's best to have Cabal wizard friend doing Patren together with you. Each few deaths/relogs you guys should meet and that should cover your SP problem (which is better than replenishing it at town while selling items). This is the fastest way and another great time-saver).
Five bars last for 1 hour which allows me to fill my inventory 2 times. After 2 inventory fills you'd still have some SP left, but probably not enough for filling it for the third time (unless you do some real serious damage. Buy Cabal Online Alz service from our site will make your game more interesting.