The pricing gap is still huge between hosted and enterprise. For 25 seats, it's $600/yr hosted and $10,000/yr enterprise. Hopefully Atlassian will drive them to fix that.
But there was just too much demand for GitHub Enterprise, so they made it and are charging an arm and a leg because they can.
The actual cost per year ends up being fairly negligible when we factor in the nearly 100% removal of administration overhead that our previous VC options required.