It's definitely helpful and interesting. The data is very user unfriendly though, and the way it is set up make a decent chunk of the data meaningless.
For instance, the min/max values are both basically useless as we have things like a unrolled Afuris riven's min/max being 10 plat and 8,000 plat respectively. This also makes a unrolled Afuris 'average' at 294 plat per unrolled riven, with a standard deviation of 1,088 plat.
This makes the information basically useless for anyone trying to figure out how much a unrolled Afuris is worth. All they know is it sells for between nothing and hundreds of dollars of plat, and that the range most Rivens fall under is between nothing and ~1,400 plat. This problem isn't Afuris specific; it applies to most every other Riven on here.