And according to the article those $99-type whales are elevated into the "high-rollers" areas where the amounts gambled for are larger... leading to a similar amount of playtime at "higher stakes" only because of digital zeros.

$3.99 to make 100 spins at fake-$100 each, vs $99 to make 100 spins at fake-$10,000 each. (numbers totally made up, btw)