I have observed too many deals on Groupon but it is very true that rarely any one of them apply. Every deal you try to look up is either expired or unavailable at that particular day.
Now it is important to know that it is not just in one case almost all the deals that I try to hook myself up I fail in doing so. Secondly even if you get one deal you will have to move mountains to learn how to apply that deal.
Basically I am not satisfied by the way Groupon works maybe they should exclude offers which are expired.