You’re reading the example wrong. It increases by 7000 credits and 1rp each time you vote.
Look at the example on connect.
Example: If you voted 3 days in a row: 1 + 2 + 3 = 6 RP and 7000 * 1 + 7000 * 2 + 7000 * 3 = 42,000 credits in total.
That example is telling you that on day one you get 1RP and 7000 credits. On day 2 you get 2RP and 14000 credits. On day 3 you get 3RP 21000 credits. Combined, those 3 days add up to 6RP and 42000 credits total.
So over the course of 30 days voting you will get, in total, 465RP and 3,255,000 credits. It isn’t saying you will get 465RP on the 30th day, but if you add all the days up you get 465RP total.
This is cumulative. Cumulative-increasing by successive additions.
You get
1RP x (# of days voted)
7000 credits x (# of days voted)