Imho its the unavoidable truth that "galacticos" as you call them such as NEYMAR are the world's very top players. To say that we dont need them or they "wont work" is dumbfounding. AGUERO is a "galactico" and works fine for ******. BENZEMA is a galactico works fine for REAL. LEVANDOWSKI is a galactico works fine for BAYERN. GRIEZMANN is a galactico (in the making) works well ... oh well I hope you get the drift.
Comparing Madrid to Bayern is just plain wrong. Every top team has some big players, we know that all well and good. I'm not even disputing that we need some big players at all but more the vision of adopting to the same way as Madrid are is a lot different. They literally build their whole team around this image.
When you look at what they've spent and then look at their success say in the last 5 years, you can hardly call this approach successful. You'd expect a much bigger return than what they do. So why would we want to adopt it?
Also lets not forget that we wouldn't even be able to like they do. Every summer we get linked with these big names and never get them. Whereas Madrid on the other hand sign one virtually every summer, maybe more than one. So it just isn't something that will work or bring sustained success at United if you want to adopt this approach, it is simply not our way, totally neglect youth as well. All our old traditions would be gone.