What about the marquis who taxes estates at 80% versus the count who taxes at 30%? It is difficult to tell (not impossible, as you can use the lord/duke income/shares) from the current tax reports as they do not cut out the portion the lord of the region/city take from estate income.
The current Tax report shows the average knight share, which excludes all the taxes. What more do they need? Of course that doesn't tell you exactly what an estate might offer you, but it would certainly indicate if a region was likely to offer a better deal, at least enough info to check it out. For instance in Solaria I can see that one of the rurals is posting a average knight income of 120 gold, enough that one might start wondering if there is room for another estate there offering that sum. In fact that Rural often has the highest average knightly income
