Let's say it depends on how much you invest in trading.
There are trading signals from people who have a good reputation and earn a lot from the number of their subscribers, so they would have a lot to lose if they didn't do a good job.
One that I use personally costs me € 250 for three months only signals, but the return is clearly higher.
If you use 0.1 btc or higher per trade and do 2/3 trades per week, then it's worth it.
There are obviously times when it runs badly, but overall, at least for me, you have good earnings.