99+% of people on StubHub are not in the business of selling invalid tickets. Yes, there are cases but as many transactions that StubHubs processes daily, it is very nominal. You are covered by the Fan Protect Guarantee. If the tickets happened to be invalid, call customer service and they will look to find replacements. While replacement can't always be found, if there are replacement available, StubHub will handle it. If not, the worst case, you are refunded your money. Not always what you're looking for when you want to attend an event, but at least you're covered.