Why is not good to play a team that has feck all to play for? You'd look to be playing sides like West Ham in the final games of a season.
Just about any situation can be spinned in a way to show some sort of psychological advantage for either side.
- West Ham are safe: therefore they'll play under no pressure with the shackles off.
- West Ham are safe: therefore they won't give a feck and let us roll over them.
- West Ham are fighting against relegation: they'll fight for every blade of grass.
- West Ham are fighting against relegation: the stakes, the sheer pressure will paralyse them.
The truth is that we just don't know how they'll react to these situations. Not to mention different players react differently: some thrive under pressure but lose focus when nothing's at stake; others fold when the stakes are high but are unstoppable when they're just playing for fun.