Alot of factors come into play when a ban is applied for botting, most common one being Time played.
Ban rates are impossible to determine to an exact figure, But more to a group (low/medium/high) with red chins being a highly profitable method of gold farming ban rates will always fall into the medium/high category, but these factors will help:
If your account is a long term account with multiple skills trained existing membership etc it will still be banned for botting but may just be delayed for a longer period of time while the jagex detection system monitors your behaviour.
If your account is a level 3 with 88 hunter and has been playing 11 hours a day 7 days a week for the past 2 weeks then chances are it's going to be banned very soon, That being said i currently have a bot going that has 67 mage all other skills 1 and its been going for 9 hours a day (purposely been suicide botting) and it has yet to be banned but this is a different money maker compared to chins, Your best bet buddy is to lay low, refrain from botting more than a couple hours a day and remember to always switch it up, Maybe before you start your bot in the morning do a few quests, or mid bot session pause your script go to the G.E merch some stuff for an hour or so then continue, ALWAYS do what a normal player would on an average day of runescape never just one repetitive activity if you're trying to avoid bans. Gl bud try keep us updated if your account survives the week