Ask yourself "Do I pay for this Google product?" If the answer is yes, then the product comes with actual support.
They should quote that on the GMail sign up page.
I am frustrated by Google’s lack of support as anyone else, but it is completely unreasonable to expect support for a free product, regardless of how they might otherwise profit off you.
I'm not frustrated because I don't rely any Google services.
I was serious, though. People would be less frustrated if they had that helpful reminder on sign up.
Obfuscating that GMail isn't a real product is just another one of their sleazy business tactics, I guess.
Comparing Google products to Google products should not be comparing apples to oranges. If Google is frustrated with customers assuming they don't support their products, maybe they should support all of their products, not just a select few.