Guys - polol, Doc and mr. Kus thx for the comments. I so absolutely get your points, and I especially agree with Docs comments about the "inital hump" not being the issue - but rather generating a mid and end game once you get over that initial issue. Im a strategic powerplayer by heart, and would hate to have a closed end game. Its like playing monopoly, owning the entire board, and everyone else leaves. Whats the point of the game if you have to stop at a point ?

I would still suggest to limit the expansion opportunities of your current brothel. This doesnt deter new players, and force players into using gangs to expand in order to earn more money. I also think its difficult in the current form to "config" your way out of the lacking mid/end game. And I agree that the Lua scripting can add a lot in this regard.
What I would suggest, though, is have a natural progression of "resources" that you need. 1. You need girls to gain gold. 2. You need territories to gain new brothels.
Expand this thinking, and you add a layer of complexity to the game that will not confuse new players, and keep veterans occupied.
An idea could be to have the 3 brothel placed in the catacombs, and in order to build there, you need to sacrifice 100 monster girls. All of a sudden you have a 3rd resource (monster girls) that require new actions (catacomb combat).
Next step could be that in order to get the 4th brothel, you need a favours from the citizens. Favours could be earned primarliy through gambling dens (so you need to setup a casino), or setting slaves and patrons free. That gives you a new resource you can gather with existing resources, and one youll only need late in the game.
Next step could be to introduce gems, or magical potions, or that your girls have to win contest or any number of "resources" that are required to be able to buy the next brothel.
Ideally, you want new players to initially do logical stuff, like whore out girls. Then get stuck, and realise you need to take over new territories in order to buy a new brothel. The Lua events and the missions are nice to give players an idea of how other options work than the most logical ones. In all honesty, as a new player, it is very difficult to identify the value of some actions like gambling and XXX entertainment, and the like.
If players cannot easily expand their current brothel (by having a steep price, maybe even exponentially increasing for the brothel in question), they would have a need to go out and get the next one in line. You can also "re-invent" some of the cool stuff already in the game, like the bar, the casino, etc. in order to make resources, or spend resources.
More types of resources = more complexity.