For a brand new A4000T motherboard I thought it sold for an excellent price for the buyer. I don't think you'll run into one much cheaper.
With shipping and labor and parts I paid almost $200 to have mine fixed almost 5 years ago and the only problem was a bad SCSI chip (which you might not find today).
After that I bought a spare motherboard and paid just over $300 and was happy to get it for that. I've never had to use the back-up because I don't use the tower much at this time. I have been spending most of my Amiga time lately on my A3000's and an A2000 I'm building.
Dan :-)