Jesus was not healing those to gain fame for himself but was doing it in the name of his Father.  Jesus knew that the healed would still go out and spread the word about the miracle yet he still healed them. 

Something else came to mind when I was thinking of an answer for this question, is that even though we are talking about Jesus the son of God, he was still human and had human traits.  Maybe he was trying to pace himself so he did not get to tired.  If he were overwhelmed by the masses and the healing then when would he have had time to teach the word of God? He would have continued healing constantly and not stopped, because he was compassionate and merciful that he would not have turned them away?  I do not know but it is something I thought of.

Thank you Jesus!