I agree with the conclusion of the Electronic Frontier Foundation at the end of the article that it is not a good deal to be paid for your data, and also think it is not a valuable exercise.
I do not believe those value calculations (e.g. 400 $/yr) will ever be the actual amount that users receive. These values are actually built up in the entire supply chain. Granting a couple of dollars for data will work to get consent from more people to harvest the data, but does nothing to mitigate the Wild Wild West of surveillance capitalism and privacy erosion.
The biggest dangers in this data collection are not in the raw data points that one provides, but in aggregation and subsequent processing by AI and machine learning applications. This derived data is probably not possible to calculate well in terms of value.
All data, once given, is out of control of the user. It can be used in any way and for any purpose, and at any time now and in the future. Wrong conclusions can be derived from it, and new very private insights can be gleaned from it, especially in combination with other data that is available about you. Political, sexual preference, character traits, emotional state, intelligence, competencies, strength and weaknesses, etc.
Maybe it would be better to talk about value in combination with the risks of data exposure. But that is also very hard, if not impossible, to measure.