We had the same problem with our sink peeling..my husband pealed the rest of the paint off and it was a very nice stainless sink. It cleaned up nicely. I have no idea why they painted the sinks but it looked much nicer after the paint was removed. He had it done in a very short time.
I too thought about peeling off the paint the rest of the way. I figured I would have to remove it to get it all off so I shopped around and found out the sink is not very expensive and went that route. I dont mind having the stainless look vs the white. Im not sure why they went with the white.. maybe just to make it more elegant..