Buying floors is definitely a possibility, but if you have low stats your money might be better spent elsewhere. Remember there are things like Penguin points, Tears of Guthix, Troll Invasion, JoT, Spin Lamps that can easily boost your skill. Most people actually recommend that's what you do until a certain level (at least unlocking occs). personally i just didnt care, my sanity is more important than some mills. i don't have high enough melee stats to solo smalls at a decent speed, (though i am training them), and ranged/mage is virtually broken in dung.