Not at all - after adding the stretch goals, for a few days the pace had increased (quite a lot, actually, to 30-40k per day, while it was around 15-20k per day the days before). But the problem is, the perks were added too late. If they added them the second or third day when the media hype was still on, they would have gained interest of many random visitors.

Whoever checks the page in the middle of the campaign has either already bought it, or had some interest from the beginning, so even if the stretch goal was "an awesome chocolate fountain", it wouldn't have gained more traction than this one.

People are forgetting one thing - the main stretch goal is 2,500k, but you need some middle ground, so people can get excited by reaching smaller checkpoints. I think that the stretch goals are really good, just added few days late.