Sold my two As a couple years ago and lucky to find buyers. Bought them thinking I'd "fix" them up. Fixed them up pretty much nut and bolt restoration paint/interior to driver specs not worrying so much about originality. They looked great! What a money mistake.
IMHO the A400 sold for a market price consistent with using it as is. Way too much for one headed for a frame off restoration. Wish I'd learned long ago to find an antique car in the condition I wanted one in without work(even harder to figure out what I wanted). Seems As needing work sell for too much(buyers opinion) and easy to find and really nice As already restored to fine point perfection not enough(sellers opinion) and hard to find like all other antique cars.
I've moved on to later model collectibles not needing work, low miles, and original paint/interior. I'm proud of myself, I passed on a Lotus(Lots of Trouble Usually Serious) with non working air conditioning otherwise in like new condition at a low price, silently repeating don't buy old cars needing work, don't buy old cars needing work, etc. I'm sure the seller knew the astronomical price to fix the AC although he was playing dumb.
Not A related but old car related: just now trying to wrap up the restoration on a 49 Ford wagon hot rod and a 41 Ford wagon flathead. No more restorations after I'm done with these.
By some miracle I bought a Toyota sports car last year and just sold it for $3,500 more than I paid!