woodcutting ftw: high enough to chop yew logs in a couple of hour ^^
lol joske, i never used bots n dont want to get banned n the thing i made money with u need atleast a lvl 110+ account, so skiller doesnt work anyways
yew trees: 600gp each: makes a couple m a day / bot (and I know people using 15 skiller bots with 99 wc : never banned)
easy money: just setting up the bots in different worlds, once everything is set up, you just have to sell in gp on e-bay
(ps. pretty sure there are bots that auto grand exchange (or something) can do, it's ideal location there : near the yew logs)
anyway I'm just saying what many others do, never tried it myself...
my point is: with this against the rules stuff, you could make a lot of money (back in the days I played rs, a friend of me sold 1 m for 10euro) 'gaming'