Main point is just for fun, not some form of actual research as, many have pointed out, it misses out a huge number of very important factors.
Just interesting to see how much silver people currently have.
It obviously misses things like income rate, asset value, even character value could come into play too I suppose as they are worth silver too.
It would be impossible to get a proper picture of what the distribution is like, however it's just a fun metric seeing how currently silver is distributed.
A graph showing silver/time would be interesting, to see the fluctuations. (As many have said, most people only have silver for short periods in order to buy specific items/upkeep/etc)