That's pretty expensive considering most banks do it for free, even when you have a free account with them...

Would you mind telling why it is more expensive than traditional offline notarization (6-7 dollars)? Do you have specific expenses?

I'm very happy to pay that price. It was annoying though that the pricing was hidden and I had to come to the comments here to discover the price.

I hope you ignore the people that complain and nitpick the price. They may be the most vocal, but there are plenty of us who value our time more than money and 15 bucks is a great deal.

That said, don't make me hunt down the price. It wastes my time and energy. Display the price and you'll generate goodwill with the customers that actually matter.