Oh! Now I get.

As soon as an investor acquires a total holding of 250 ADVD tokens, he/she receives 10 ACUV pack.
When his/her holdings sums up to 500 ADVD he/she receives another set of 10 ACUV tokens and then begins to receive a lifetime guaranteed upvote once a week.
When his/her holdings sums up to 750 ADVD he/she receives another set of 10 ACUV tokens and still continues to receive a guaranteed upvote once a week.
When his/her holdings sums up to 1000 ADVD he/she receives another set of 10 ACUV tokens and then the guaranteed upvote is increased to twice a week.
And so and so forth.

I think I didn't really understand the chart when I first looked at it, but now I do. Thanks for the clarification 😊