Well, I've used a paid Graahk scripts for months on 5 accounts and got a minor ban after like, half a year (on nexus, old bot).
However, when botting F2p, you should stay vigilant, I got 8 accs banned within a few hours from not checking them, also I was using free scripts (chicken/cow killer, wc'ing)
I'd recommend checking on the quality of the scripts your using beforehand.