I don't know. I mean, money would obviously be a huge factor in him coming to us if that would indeed happen. Part of it would be the agent fee (don't mind that given the opportunity and our shite defense, though that whole part of the game is out of control) but I'm hoping it's nearer 150-200K. Then there's room to increase his wages and tie him down further when he inevitably would get linked to Barca/Real/Bayern later on.
Let's say rumours of 350K is true, what is then the new benchmark for squad players? 200K? And if he wouldn't have a great time of it for the first 1-2 seasons, what would the other players be asking for? That's sort of what I'd worry about.
Don't get me wrong, I'd absolutely love for us to sign him. But not at any cost though.
Likewise, I really hope rumours of 300K for Rashford are widely off the mark. He's not proven anything yet really. Should be incentivised deal starting at 150 maybe. If he plays well, he earns more (goals, trophies, etc.)