Avoid f2p items. Seriously, there is soo many f2p players; so numerous that there is no difference in supply between has bot and without bot. Why herbs? I'd say the money is on secondaries , not the herbs themselves. But anyways, if you anticipate herbs will rise, you should invest herbs NOW, not after they went up. As a side note, although I hate admitting it, now is the time for flipping rather than going for long term.