My point though is that in order to get those "extra" luxuries you have to pay cs's and that comes out of potential ra money.I'm only talking about selling the extra luxuries gained through the alliance with the CS, not the extra luxuries I have on my own.
Normally I have 2, rarely 3 cities before NC. I like to play on dense maps and if I wait for NC I will usually lose good city spots. Getting 1 new luxury per city can be challenging looking at the 3rd and 4th city spot (at least when trying to keep the cities close enough so they can be defended).
I didn't say each new city has a luxury I said an average of one per city. Almost always you get two in your capital and 1 more near by. If you play on immortal or deity you most likely wont be able to expand like crazy as by the time your done with your national college (with a two city setup) you're surrounded by mass expansions from the enemy. This means you should have plenty of happiness until you get to make Colosseum or dip into piety.