Most speakers don't sound good on the floor, gets boomy and the mid and tweeters would be aimed at your knees. Plus the crossover caps would all need replacement at this point so the recommendation of rebuilding the crossovers is important. The Alnico dome tweeters are supposed to be pretty nice, sourced from Long Engineering.
But the OP has a point in that if they don't sound good to you, it's hard to consider buying them with low resale value unless you're in for a project or experiments.