I'm guessing that, making 46000+ a month, Sakimi-chan has tens if not hundreds of thousands of fans. Is there a possibility that she isn't so much continuously ignoring her non-paying fans so much as she's priotizing? That is a TRUCKLOAD of fans to deal with, and there are only so many hours in a day.
Is Sakimi-chan being "a total dick" to her non-paying fans, though? Ignoring them - while not the most sociable thing to do - isn't, in itself, dickish. Has she been trash-talking people? Is she actively mean to anyone? Is she telling people who aren't paying her to piss off? I'm asking because I honestly don't know. I've seen her art pass by on the dA front-page and photo-sets on tumblr, and that's as much attention as I've paid.
And to get back to the pizza analogy - you're pointing out that people who get bad customer service will take their money elsewhere. Keyword here being "money". If your main complaint is how she's treating people who AREN'T paying, they're not customers. They are not entitled to any customer service. As long as Sakimi-chan is giving the promised rewards in return for the money given to her, and doing what she promises to do, we can't really pass judgment on how she runs her business. And, again, is she mistreating her non-paying fans, and if so, in what way?
Are they? Is she? Like I said, I don't have a clue about Sakimi-chan and how she behaves, outside of what's in this thread. If the pledge-levels keep getting raised, I can see how that's a problem - if you choose to pledge at $3 a month, or whatever, you shouldn't suddenly find yourself paying $5 a month. But seriously - is she being terrible to her non-paying fans? And I mean, is she doing anything other than not replying to comments?
I am honestly curious.