Aubameyang would probably have been closer to £80m though if he were a couple of years younger and it hadn't abundantly clear for a while that his relationship with Dortmund had disintegrated beyond repair.
He's only 28 and has been followed by all the elite clubs. He's been one of the most sort after strikers in World football for a good few years. Yes he's made it pretty clear he wants out. Is that not what Mahrez is doing? £55m should be our benchmark. Courtinho is leaving one well paying CL club for another. This is different.