Is $2,844 too much to pay for a fuse?

Yes. End of story. 

Hahahahahahha
for a fuse?
snake oil and major profit!

  People will pay anything if their told 

   Sounds like ...
crazy people. 

Lest we forget, it has been stated many times that Synergistic will replace blown fuses.

Yes it’s much better for "snake oil manufacturers" to hang on to your $150 and give you another 10c fuse instead, they could keep doing that many times and still be in front

I remember as a Electronics Engineer designing and building Electronics for the Navy, we had a saying that a five thousand dollar part will protect a five cents fuse by blowing first.  I can't tell you the number of times that the expensive part fried before the correctly spec'd fuse was suppose to blow.

just a side note on the path to enlightenment.

enjoy

Most of the fuses in audio equipment is there as a safety measure not to protect the equipment, but to prevent fire. A fuse might blow before damage to the equipment but that's not what the primary purpose is.