The only time the script bugged on me was when runescape updated and the client wasnt updated so it couldnt identify certain objects/items; Ive slept overnight making my bot do all f2p just to test and it actually did it lmao
idk I feel like for the amount of quests it has and success rate, 20$ is very well worth it.
If you still dont think its worth it, just add up all the quests listed on this bot + the cost of service from service providers = more than 20m probably?