Downtube shifter bikes are having a really hard time these days. Everyone is selling their pandemic bike purchases at firesale prices, and that drives the rest of the market down to the point where it's just not worth it anymore.
This one has eye-catching paint and a chrome fork, but Reynolds 501 tubing and the Triomphe group are not highly valued these days, at least not where I live.
A year or two ago, $300-400 would not be unreasonable. Today, I'm thinking $200 tops, and $150 for a quick sale.