Most SSL/TLS certificates come with a warranty
At the lower end of the spectrum warranties typically start at $10,000. This is for most DV certs and a few OV's. From there warranties go up to $50,000, $100,000, $250,000, $500,000 all the way up to $1,750,000 for some Symantec products—that's right, Symantec is so confident in what they're selling they'll give you $1,750,000 dollars in the event something goes wrong on their end. They call it the NetSure protection plan.
That's a lot of money.
And that's just one more reason why you should feel confident in purchasing an SSL certificate. If anything goes wrong that causes you to lose money, you're covered.