As to Moutinho's pay, I don't know exactly what it is either.
But i don't have to be a whizz at maths (and believe me, I'm not!) to know that Porto simply can't afford to pay him what we can afford to pay him.
I don't have the latest figures to hand but, in 2008-09 (a year in which Porto won the Portuguese League and reached the quarter finals of the Champions League), their turnover was a mere €68 million. In the same season, Spurs finished 9th in the Premier League and were knocked out at the group stage of the Europa League. Our turnover was €133 million.
Porto have net debt in excess of €80 million and operate at a loss (on normal operations) every season, with their costs generally exceeding income by some €20-30 million per annum - which is why part of their strategy is to sell one or two top players for a big profit every year. Even so, that makes their total spend in 2008-09 some €40 million less than Spurs'.
The gap has only grown over the past few years.
So it stands to reason that Porto simply can't begin to compete with the likes of Spurs when it comes to wages.