Why should I wait? If I can't access the site to make a buying decision, imagine if I had a technical issue or needed support? Am I supposed to wait every time?
This is not a standard issue. They just had a large event, so a lot more people are trying to use the site relative to their standard visitor count. Traffic will probably be back down to standard levels in the next few hours, if you're able to wait that long without having a heart attack.
No thanks.