Holes = cheeseless area
More holes = more cheeseless area
You might have confused cheeseless area with less cheese. If you earn something at an expense but you earn a total net benefit, it wouldn't be right to claim that more earnings = more expenses = less earnings. More expenses are not less earnings especially since more expenses means more earning and more net benefit.
Both the total volume of cheese and the total volume of holes increase proportionally. In the end, when x approaches infinity, both of them approaches infinity.
More cheese lost correlates with more substantial volume of cheese and if the factory producing the swiss cheese is the same, then the proportion of the holes to cheese is relatively constant.
You might have confused cheeseless area with less cheese. If you earn something at an expense but you earn a total net benefit, it wouldn't be right to claim that more earnings = more expenses = less earnings. More expenses are not less earnings especially since more expenses means more earning and more net benefit.