I don't know that size of your operation is the right metric to gauge whether to bother with this. If 100% of your revenue, for example, is from online sales, it might be worth it even if you're small. But yes, it's often not worth it.
I agree, it's just for some DR scenarios there's only so much you can do. And 'the internet is down' is hard to plan for.
If CNN is offline due to some outage and you're a smaller enterprise then are people really still doing online eCommerce stuff, or are they waiting for their favorite sites to come back up as a signal that things are back to normal.
But we're talking about what was a 1 hour outage. Does it make sense to spend more than 1/8000 of your revenue to avoid an hour per year esp when you will never lose an hour of revenue from being down for one hour because many customers come back to buy the thing they were going to buy anyway.