I’m spending about an hour after each Traveller session (itself usually 2½h) updating our Kaylash campaign wiki with notes on money made for trading, money spent for repairs, maintenance, salaries, etc. It’s a lot of bureaucracy. 
Unlike D&D 3+ where players can spend a lot of time away from the table thinking about their character and tweaking it, Traveller seems to be the game where players can spend a lot of time away from the table thinking about their ship’s finances.
I’m not sure I like it. Right now we’ve been rotating game masters, so I’ve been recharging my creative energies, but once I return to running games, I might not feel like updating the site. My players don’t seem too interested in it, and yet the rules afford spending a lot of time on it – just like D&D 3+ rules encourage players to spend time tweaking their characters.
You’re not required to do it, but the rules invite you to do it.