The value if it was, say, '68-'70 RR bench, or E-body/Charger buckets, is that '73 Satellites are well below those on the "food chain".
Folks that own them aren't sitting on a bigger-dollar car, so they're not as likely to spend up for parts.
Condition matters, of course, but IF there's someone out there who needs that seat, I'd bet they're not thinking $300 or so.
It's a pity - I hate seeing good stuff go to waste - but that's a fairly tough niche.
For that matter, I tried for a couple years to practically give high-back bucket seat foam away...here & CL - and finally, it hit the dump.