That is very reasonable. With DigitalOcean, All I could find was:
"Policy
Do you charge for bandwidth?
Yes. Plans start with 1TB per month and increase incrementally. Once the monthly transfer limit has been exceeded, the cost of bandwidth is $0.02 per GB over the limit."
I'm sure they have restrictions somewhere on "pooling droplets" in getting around the $0.02/per GB limit (which is already very reasonable - I wonder how they feel about customers that make a lot of use of that $0.02/GB? Amazon, even when you get to the 5 PB/month tier, still charges $.06/GB in the Singapore Region)