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The only thing that I can tell you is that you did the best that you could do for your dog and that is all that you can do.
There is a good chance that the dog would not recover, even with supportive therapy. I think that the chance of him surviving would have been very low and that it may have been a waste of your money.
I am very sorry for what you are going through. Now is the time to think about the good times that you had with him, not the way that he died.
If you are not familiar with the rainbow bridge (a special place that pets go when they die) just let me know and I'll share the story with you.
I am very sorry for your loss.
Let me know if you still have questions.
These after hours vets provide a service. They have to be open at night and they have to have specialized equipment to test for problems. They DO incur a lot more expenses than a regular vet.
It's like apples and oranges. If apples are in short supply, vendors can charge more for apples.