Absolutely this! The uncertainty freaks me out. I don't have money to pay thousands of dollars as a result of some bug or attack.

I'm in love with DigitalOcean because you know the price you'd pay each month. If it's just 5 USD or 5000 USD, it's what you expected, nothing more.

I believe the rest of the clan (Linode, Vultr, etc.) give you the same certainty.