This is an interesting model, however right now there is no (apparent) incentive to give fat tips.
John Light

The model is not as simple as you understand it. You are incentivized to endorse a post with a larger tip, sooner, as it increases likelihood of more tippers. And, you can tip any amount- the avg tip amount will vary based on content type and globally what people are comfortable shelling out. It’s a model that’ll adapt overtime, as stated in the text. This is a preview launch. More details will come later.