I don't think it's that small, it 10% of your bill for business support. ($100 if you are spending less that $1k).
And the support is ok sometimes. But when you actually discover an issue on their end they constantly try and flog you off, and then don't get back to you for ages.
I've yet to replicate that latter observation, having worked with AWS as an individual, part of a small company, and (currently) part of a recently-unicorn-statused startup. AWS support has always been pretty acutely responsive. This is obviously better if your company's big enough to shell out for enterprise support, but even the middle support tier (the one presumably being discussed here) ain't bad at all.
And the support is ok sometimes. But when you actually discover an issue on their end they constantly try and flog you off, and then don't get back to you for ages.