Sai always takes care of His devotees in such a way that, love and unity between them remains everlasting, leaving no room for jealousy or bitterness of any kind or even the temptation to copy what the other is doing.
Especially for this very reason, Sai earlier did not allow His birthday to be celebrated, as He felt that all would think of buying a gift for Him. Then, if someone is unable to buy, he would feel dejected or the devotees also might imitate or compete with each other in buying gifts, thereby unnecessarily upsetting their minds!
But now, due to insistence of devotees and for their sake, Sai has agreed to celebrate His birthday!