I think, robots may work, but it's very hard to find the right robots (robots that really works for a long term) and it will take long to make a nice amount of money. It isn't as easy as they say / as some sellers promise.
Personally I would never invest $2000 or $10.000 as some sellers recommend. I always start with a small deposit and let it grow. (because I don't want to loose that much money).
Many ea works today, but will they work tomorrow is the question. (better think of will it work the next years).
Finding a technique that is working for many years is pretty hard.
However, if you keep the risk very low,you will not earn that much, but at least the risk is low, and it is profitable, for me it's better to have very low risk and earn a little, than high or medium risk and loose all.