I cant say that yesterday bonus as small bonus, bear in mind that there are so many registered users in stake. All of them get the birthday bonus, of course the amount of the bonus is based on the account's level. I received 111XRP yesterday, it is not a small bonus as it worth more than $30 and I believe higher level than mine gets higher bonus. Mathematically, the total amount for early birthday bonus yesterday is big already IMO but I believe there will be another celebration on the main day.