Bonus items may vary for a number of reasons.  It is normal that the bonus amount may be more or less depending on different criteria, so everyone should read the TOS carefully and then accept the bonus according to the criteria he/she is comfortable with. And always keep in mind that when you accept the bonus you have to accept a large wagering requirement.  Which can be as low as 10x to 200x. So read ToS first then decide, you should accept bonus or not