A bit of a loose analogy there mate.
Do you genuinely think if we only signed players from the championship or relegation fighting teams, we are going to improve enough to surpass clubs signing the manes, the eriksens, the payets of the game? We have already bought villa's best player once, we keep buying their best player and the quality diminishes each time.
Plus we need to be signing winners, leaders, fighters etc, if we are solely shopping at the bottom end of the league or below then how do we do that? We have palace's best player, swansea's best player, villas best player, fulhams goalkeeper (or saints back up keeper) and west ham reject. When you consider that
a) look how those teams fared/are faring
and
b) look how they fared before we came and bought from them.
You have to question that mentality. It is a small club mentality, and we aren't improving. You might think theoretically signing the best player from a crap team would benefit us but consider this,
we sign 11 best players from 11 crap teams who do/fight relegation each year.
Have we got a good team there, or a relegation one?