honestly dude, most combat fighters max at around 400k/hr unless your maxed melee.
most skills suck at money p/h.
runecrafting deaths is about 450k an hour and once you hit 90s you begin to make double deaths more often so this is probably the best method to bot money for atm. double nats CAN be more money but the market for nats is very unstable atm and sometimes they can be hard to sell, so id reccomend deaths.
If your high enough slayer, bot abyssal demons. about crimson charms per hour on a maxed account, about 100 kills an hour and usually the whips and rune drops average out to about 850k an hour (ive botted 3 abyssal heads here, im pretty experienced at this spot). Definately reccomended, great cash, decent xp, good charms low ban rate (ive ran abyssal demons 3 days straight, that was 6 months ago and no ban.)