Perhaps suggest a current-model amp in the 200±wpc-@8ohms available for around the $200 it costs to get a gently used Crown PS-400, Adcom, JBL-Urei, or BGW and we'll try and toss one in our Mid-Atlantic JBL comparo in hopes of answering your question. I suppose we could just use Heather's H-K AV receiver but I don't think that's what you had in mind.
For me it's value for the dollar. I bought one PS-400 from an LH forum member for a reasonable price and the other from a DC-area recording studio off Ebay for $100. How could I pass up either of those offers? My DC300A-II came out of a Lowe's Theater regional refurb where they were selling them off in bulk on Ebay a few years back. I also have a two PS-200s, one of which came from Ebay from the original owner having just returned from Crown for a complete check-over—in the Crown packaging and with the receipt for work that totaled more than what I paid for the amp. So, if the question was more than just rhetorical: I use old amps because I like the sound, like the value they present, I can run three-or-four complete systems for less than one with new componentes, and I've never had a moment's trouble with what I have. I don't think I'm short-changing my system, I'm not into bling, blue lights, or big meters, but I am curious to hear your opinion on what it would cost and what you'd recommend to give my system what the Crown's offer but in a modern, new amp. :dont-know