I'm probably not the first to write this...
Just my opinion, but I'm very annoyed by gates on large international airports being filled so fast with 10 gate limit, so if I'm flying to Toronto from US or to Manila from China I have to use only 747s and A380s on very short routes if I don't want to fill the limit with the first 6-7 routes I open with realistically expected frequency from other very large airports at short/mid range, like 10x daily with suitable A321s (or A330s or even 773, they clog the 10 gate limit too fast).
I think very large airports like these should allow more gates to rent because they generally have a lot of gates to offer. Maybe there should be 40M pax limit to rent 25 gates, and 20M to rent 18 gates.
Of course, someone's gonna call me a spammer now. (but I prefer thinking of my strategy as over-sized somewhat-realistic flooding )