if Urbit achieves full adoption, there’ would be 256 galactic senate members representing 4.3 billion planets
~
Francis Tseng, Who Owns the Stars
There are 256 galaxies and 65,536 stars across all of Urbit. There are roughly 4.3 billion planets that were initially evenly distributed across stars, so each star started with 65,000 planets. In the long-run Urbit developers believe $10 to be a fair price for a planet. Assuming that the price eventually converges to $10 per planet and Urbit achieves widespread adoption, then each star is worth $650k in planet real estate alone. Planets are also expected to pay a monthly fee to their stars for routing services (which is the bare minimum service; the star may choose to offer services as well). This fee is estimated to be anywhere from $10–$100 per month.
https://www-cs-faculty.stanford.edu/~knuth/boss.html