Only if you bump into one for $200.  Even then only if you don't get $400 back out of it.

The only one who was able to answer that question was you and you've done so.  "It was worth $400 to me to complete my 1898 carbine" is what you thought and so it's what you did.

Don't sweat it.  It's not as if you'll only ever be able to get $20 for it.  When the economy picks up you can dump it and likely make a profit.  Then you'd have to pay $500 to replace it so you'd be back in the same boat.

So, no.