How many houses do you think is the right amount for a world?

@telmarina all good, was useful info anyway lol.

So far I haven't had the game move in any sims, the only sims in houses are the ones I have made and place or their offspring. I haven't changed any settings or anything it just hasn't happened, which to be honest I am quite all right with since I have be some what micro managey with the gene pool lol. I counted up last night I have a total of 63 houses with 26 on them occupied and space for another 10 maybe.