Let's use extreme cases to help understand:
Case 1: Gondolas dispatch once per second and there are no gondola 'waiting' in the station to board. In this case as a gondola is coming into the station, it whips around the wheel and gives people just one second to board. Not really possible.
Case 2: Gondolas dispatch once per second and there are 100 gondolas 'waiting' in the station to board. In this case, when a gondola enters the station, it gets in the queue to leave. But, there are 99 gondolas ahead of it. They are leaving once per second. The gondola that freshly arrives has to wait 99 seconds before it leaves. It moves at a slow crawl through the station detached from the 'rope'. There's about 40 seconds on one side to disembark; 10 seconds around the wheel, and then 40 seconds on the other side for 8 people to get in. So, just because the gondolas are dispatching once per second, that doesn't necessarily give a gondola in the station just one second to exchange passengers. The extra gondolas waiting in the station are moving at a crawl.
Now, when you change up the numbers you don't need as many gondolas waiting: Dispatch every 7 seconds and have 10 gondolas in the station's queue gives each gondola 70 seconds of a slow crawl before they each jet off.