There are lots of types of bots but since we are on a trading discussion board then you are obviously talking about trading bot. Are they worth  the time and effort?

Dont think that bots are money making ones because everything is just really  been used  for automation of your trades and of course that would really be still into your supervision or own trading  setting.

Profitability would always vary on how you to  set up your bot on specific market condition and not just putting it on and would work for you, thats not the overall concept of a bot.