I agree with you that net spend is not the be all and end all. Christophe Samba was signed for 12m In the same week that Seamus was signed for 60k. One gives a great net spend, but the other is a much better player. I do acknowledge that this is the exception rather than the rule.Completely agree that the player recruitment is the key issue for us these next few years, irrespective of how much they cost, hence why I stated that net spend isn't the be all and end all in my original post. What you do with whatever money you have is what counts.
However the issue I was trying to highlight which you state as well is that generally more money and more wages= better players the majority of the time. We can all name expensive flops (schevchenko) and amazing bargains (kante), but the overwhelming fact is that the more money you stump up the better your chances of signing a quality player. I'm not telling you anything you don't already know, it's some other posters who seem to be in denial about this.
The fact is I don't care too much about our net spend, so long as our money is spent properly. Some of our signings this window have been shrewd acquisitions- players in their early 20's yet to reach their full potential. I'm all for those signings. My concern is some short term thinking that still seems to be present in our business. Williams last year is a perfect example. A 32 year old centre half, who's spent his entire career in lower league or a bottom half premier league team. He looked average last year and is unlikely to be better this year. Similar short term thinking can be applied for Wayne Rooney. He was a legend and was a great player. know it was a free transfer, but his wages certainly aren't cheap. That allocation of our budget could have gone somewhere else. It's why we really shouldn't sign Giroud. 31 years old who could perhaps do something good this year, and maybe next. Then in two seasons we'd have to replace both him and Rooney. When you can't go out and splash loads of cash and have an ultra positive net spend you need to be smarter and plan ahead for the future seasons, not just the immediate present.
I do disagree with your implication about buying older players with little or no re-sale value. If those players can get us into the champions league rather than the europa cup, then the outlay was worth it, both financially and in terms of progressing the club. Sometimes short term thinking can lead to long term rewards.