This is a really weird argument. They are a company supplying a service, why should they ever have to shoulder the bill?
I'd argue that if things stayed the same, this small company would subsidize you: if you have 100 accounts using 1 repo it's more likely you're using more resources than 1 account with even 1000 repos :)
Edit: My parent post is being down voted and that's fine, my point was not made in anger, it was an observation that smaller companies are having their monthly costs decreased, and the larger companies are seeing an increase, for organisations created after today that's a fair premise, but for those organisations that have been using GitHub for years and have now seen their monthly costs increase, it's a slap in the face.
It's been 8 years since they revealed their pricing model, which has remained mostly unchanged on the lower end and only adjusted on the high end to account for GitHub Enterprise and suggest people move to that instead of the gargantuan $3k/mo plans. I don't know many SaaS companies that don't tweak their pricing much more infrequently than that. Thoughtbot's Giant Robots Smashing into Other Giant Robots podcast for the past few episodes has been consistently talking about A/B testing pricing models, prices changes and signup, conversion and churn, as a weekly adjustment on some of their services (FormKeep, Upcase, etc)
Come on. Those things are not happening.
Does 0.15% of your budget matter? Does GitHub not make your team 0.15% more productive? Would the switching cost to a new tool be less than 0.15% of your total cost?
If you are doing that math and coming up with the answer that switching makes sense, by all means do it, but I would argue that your problems are bigger than your GitHub bill. I personally can't fathom working for a company that strapped for cash, I'd be looking for a new job myself.