Hmmm, I don't think we are fundamentally disagreeing.Rank and camscore are not the same thing though. And if the tip pushed her into or near the Top 100 or Top 20 it could easily cause that increase in tokens.
If a 35k tip propels the model to such heights that she earns 70k tokens rather than 30k, then the tip is definitely the way to go. If this is what we would commonly expect from such a tip, then yeah, tips over WU all the way to the max.
Beyond my own experience, I tend to doubt higher rank / camscore would have such a peripheral benefit just with some thought experiments: like a camgirl that already had a high cam score and was front page material. In that instance, the money over the boost would be preferable as she is already on the front page.
Of course, you ladies will have a better impression of what is feasible, worthwhile, etc and I assume you make the best decisions in the management of your business.