It's one thing to take full advantage of a deal. It's another thing to defraud businesses that are doing promotions to get new customers.
The site says you may buy 3 per person, but then will only let you purchase 1. I figure if my dh and I each bought the 3 we were allowed, that is still less than what I actually bought.
I do understand your point but it would be difficult to buy very many of these cards. I'm sure they know that and have it set up the way they do for that reason.
ETA: WOW! I just googled them and the feedback is HORRIBLE, as PP mentioned!! Yikes. I've used them twice and got my gift cards quickly and without issue. I will think twice about ordering again in the future, though.