Dobbo Dobbo
From experience I would have to agree with you, having used SQ service since inception 4 times now, and flight is picking up more passengers from Man each time I have been on it. Also to be honest SQ V Virgin is not much of a contest in my preference stakes, and when you add in the "joys" of Atlanta as your US entry port why would you bother, unless you need to be in that area.
Regards
Mr Mac