I agree 100%, for that sometimes its better to avoid some bonuses time to time.
If you not are 100% and its not a really good one i recomend to you to avoid.
What are you trying to say in your post? What he is referring to is that you should take a look at terms and conditions and if it suits you then only accept them and sign up for casinos.The deposit bonus is different thing which you get when you sign up on casino but if you get other bonuses as well so why you should not take them? If you are saying anything else I am not aware of that but for casino should be legit and good response from them even if they don't give too many bonus to players.