That's a good analogy since the corner shop is going to be sold out of their small stock of umbrellas during the rain storm so you won't be able to buy one until the rainstorm is over but at least you'll have protection for the next storm. If staying dry is important to you, you should buy the umbrella before the rain.
That continues the analogy -- it doesn't rain often in the desert, but almost all deserts receive rain. And since it rains so rarely, you're certainly not going to find an umbrella during the rainstorm.
So again, if staying dry in the rain is important to you, buy an umbrella before the rain, if you don't care about getting wet from time to time, then no need for the umbrella.
While the personal blog owner may not care about DDoS related downtime, he may face extra usage charges due to higher bandwidth, CPU usage, etc that he'd like to avoid.
1 person using an umbrella, 4 are not. I'm starting to doubt if you're even human given that normal people don't go throughout their entire lives always carrying an umbrella wherever they go, even when it might rain.
