Yes is a good way to motivate new players into depositing high amounts to get a higher percentage in the bonuses, but then what players should take note of is that most of those bonuses come with some requirements and not all new players can meet those requirements one of such is.
*wagering requirement, this is the toughest thing to meet, when a player gets $1000 as a bonus he may be required to wager the entire amount before he can withdraw the balance.
This has led to many losses and unable to meet those requirements.