I agree entirely with that however I cannot believe that they would not take advice on the subject. People don't get to where they are purely off their own thoughts. They take advice from all corners and decide from there.
If they were to be in the 'status Quo' camp and next season we were to go down they would have missed out on a huge amount of money from not selling. To me it's either invest or sell. I would guess the 'difference' is in the how much to invest rather than 'we don't want to' region. Namely that maybe the Liebherr's and advisors accept that they need to invest to advance in the league but do not see the expansion as 'value for money' at the moment.
That expansion is something that is one of Cortese's key things. I personally could see that this is the stumbling block and not that he wants £50m for transfers and the Liebherr's say you can only have £25m.
As for your last statement I would beg to differ

I am also a football fan, Saints through and through
but I'm poor so I'd keep some for me