I agree Adrian. If Man Utd want Mane, it's to improve what they already have, so why wouldn't he go for an absolute fortune? Especially when the new TV revenue kicks in.
You touched on it with Martial (and I believe the total cost is after add-on's is £50m+)
All of United's forwards cost an absolute fortune:
- Rooney was £27m (over 10 years ago!)
- Mata was £37m
- Fellaini was £27m
- Depay was £30m