Too many people here fail to realise that a good idea can become a very bad idea if the conditions are not right. Would it it have been a good idea to disproportionately waste (not use, waste) a significant portion of our budget just to feed a fetish? No, it wouldn't. Marotta has to juggle considerations, not just the one "bring aguero here no matter what", which seems to be what most fans live by. Entering into bidding wars and overpaying for players might work in the short term but it would milk our budgets dry when every club tries to get the most out of us.
It's really amusing to observe that people here seem to think about transfers along the lines of "if you want it bad enough it can be made to come true, no matter what". Unfortunately a deal has to be done between various parties and getting invaded in the backside just becauses of an obsession with one player is bad management. Period.