This hypothetical suggests the ability to win is directly proportional to the amount spent. It isn't.
If Alves, Walker Semedo and Karsdorp, and Conti are all ranked the 5 best RBs available. All 5 were members their respective leagues starting 11, while Alves was in the Champions League 11. The assumption is any of those 5 have a high chance winning you a treble.
Of those 5, Walker cost 45, Semedo 26.25, Conti 22.25, Karsdorp 13.5 and Alves free.
In determining which of those 5 is a bargain, there is no present scenario where Walker is the answer.
Same is the case for Mendy in comparison to other team of the season LBs who moved.
True, but since we dont have salary or fee caps in Football and FFP is not longer as significant for us, we're not really looking for bargains. Looking for players who will make us the best in Europe