Actually there is no limit, there is a threshold of skill (minimum times to compete). Countries do get an initial 'free pass' in the event someone doesn't make the threshold, but anyone worldwide who makes that threshold at a registered event will receive an invite. (though not all have the resources or capability to attend)
More foreigners doesn't instantly = more views. More GOOD foreigners most definitely would though.
Quote:
The "A" standard is the most difficult to achieve. An NOC "may enter up to three athletes for each event on the athletics program, provided they have achieved the A standard. In addition they can enter one reserve athlete for the same event provided he/she has also achieved the A standard."[1]
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