
Wow. Look at all the chatter, just for me pulling CariElf's leg.
I've said, that if they are a sleeper ship, or a moneyless society, there'd be nothing to tax. You cannot tax cargo while it is in transit, and you cannot tax what people do not have.
There are indeed incidents where new colonies were revenue/tax sources shortly after being founded. Those were very resource focused colonies, but they did turn a profit quickly, and that was why they generated revenue for the motherland.
Now, that being said, we need to remember we are talking fantasy, not reality. In reality, we never had something the size of Manhattan with 10 times the population density travelling 6 months to a year to reach its new geographic location. If people are living and working in their travelling Manhattan, they are either living in a moneyless economy (sharing everything with enforced rationing) or they are using capitalism to distrubite their resources. However, I have difficulty seeing such a large community shifting from a moneyless society to a capitalist one, just because they got plantside. After all, when they first get there, the only infrastructure will be the colony ship itself. And people with power have a bad habit of just not surrending it just because they said they would. Reality implies the transition from ship life to planetside would be a much more troublesome matter. Indeed, why wouldn't many of your colony ships just go trucking off for deep space, cutting all ties with you? The people in charge would then have their own personal king and queendoms them. At least, some of them would. Now, that wouldn't make for a fun game, would it? You build a colony ship, and give it orders to cross 6 sectors to colonize a new planet. Somewhere along its trek, it decides it doesn't belong to you, and just takes off for the edge of the map, never to be seen again. Certainly more realistic but not more fun.
So, it just makes sense to me: colony ships must be sleepers. Now, star bases, those are flying cities. They just don't fly anywhere very fast.