From: ibot101
not sure if this got overlooked or really sucks, but red spiders eggs are 1.5k each, no stats required (I think monsters are unaggressive), and f2p + are used on a very large scale so prices won't tank
I looked at the red spider egg idea but it is 2 egg spawns every minute, which means a maximum of 120/hr, probably closer to 100 or so due to banking. 150k/hr isn't bad for F2P, but bananas make 500-700k/hr P2P. And while some people aren't P2P, for a strictly money-making script i'd argue that:
150k/hr x 24 hrs = 3.6m
500k/hr (at least) x 24 hrs = 12m
In a single day of running the script, you've made up the cost of the bond and more. Now it does say that there is a spot in lvl 1 wildy in the edgeville dungeon that has 6 red spider egg spawns(that is P2P only). With a glory/lodestone banking at edgeville (and assuming those spawns are about a minute as well) I estimate that you could get 300 or so eggs per hour, which is about 450k/hr. Then you run into the same notion as before, It simply makes more sense in the long run to just invest in a bond to access better moneymaking methods.
In short: it makes much more sense (for strict no-exp GP gain only scripts) to invest in the bond and increase your profit greatly, to cover the cost of the bond 10x over.