Perez offered him about as much as one possibly can, PSG will always be able to offer more, its that simple.
Possible we will try again in a few years, but we shouldn't, perhaps other clubs will join in though, City vs PSG battling for his signature next? That would be something.
What matters in the end is what Mbapp? wants. City are rich but they weren't even in contention for Mbapp?. Fat chances Mbapp? only considered Real Madrid (we know they had an agreement last year) and PSG (they got an agreement recently according to his mama). The question is why only those two clubs ? Being a very rich club is an obvious requirement for Mbapp? demands but Madrid seems to be the only one in the running probably because he has a liking to this club. However, as shown, a liking is one thing and Mbapp? being cold hearted for his professional choices doesn't mean Real will get a free pass. PSG may be able to offer him more but it is not sure he would want to receive it. I consider this short term contract as some sort of early parting gift for both parties.