How many of you who make claims whether or not Bale is worth this or that fee have any clue about Manchester United's financial figures, and how the arrival of Bale would change those figures?
I don't have a clue myself but how much Bale is worth for Manchester United has probably quite little to do with how many games he plays next season, or the season after that.
The club is a private and listed company. The ONLY thing that matters is how much money the club can earn on Bale. The ones who makes the decision about how much he is worth as a investment will not look at how much he can provide in money for trophies since that is very unreliable. They will look at how much he is worth in terms of shirt sales, sponsorships, expanding the Manchester United brand etc. etc.
We probably don't have a clue about what money is too much money but I would like to stress that things like his injury proneness is only relevant to his value on the transfer market if it affects his value as a brand. Thus, how much less shirts will Bale sell if he plays 20 games instead of 35 is relevant to ask yourself. If the answer is that he will not sell less shirts it doesn't affect his value.
Paying £150M for a crooked Bale might be a much better business investment than paying £40M for Matic. I have no idea.