The it's not our money argument is utter nonsense. Unless you are suggesting it's unlimited
Its not, im assuming Walsh and Koeman know what is in the kitty is and if they feel they can get in the players they want within the funds available then its irrelevant what he costs. What we're almost implying is that they dont have a clue what they're doing if they spend 50 million on Sigurdsson as that means we cant get player X, but there is no evidence that that is the case.
Although to address your later point it was Moshiri that told TalkSport:
"We have no restrictions to spend,"