I would assume most people who took their finances seriously would keep track of this. Personally I wouldn't upload such data to a centralized server for a number of reasons, but I keep a spreadsheet that's updated periodically including a historical plot for posterity. I keep a financial journal with goals and plans for various market conditions. It's nice to revisit every few months and see how well my plans matched my actions. I find that tracking net worth forces me to face reality and remain objective. Likewise, the process of planning/anticipating the next year or two (both my own goals and broader market conditions) and then evaluating the result once it arrives can also help moderate the worst emotional impulses that often hender financial plans.

Anyhow, the real question is: what unit do use for the denomination?