I'd reiterate the comment about checking gunbroker to see what current prices look like. I own a bunch of model 60s and have never paid over $175 or maybe $200 for one.
Prices can vary significantly based on age, features, conditions, etc.
They can definitely be finicky when it comes to performance. I keep a stockpile of spare parts on hand and have had good luck keeping most of mine running smoothly.
I really enjoy tinkering with them, though. It's quite satisfying to take a jammomatic and transform it into a sweet shooter.
Some work great right off the bat, and some need a little love. Recoil springs, buffers, feed throats, and ejector springs are common issues on these rifles.
It's also important to note that there were multiple design changes made throughout the Model 60 production period, so parts are not always going to be interchangeable on any two given guns.