I can't see on page 5 that it says you get to raise you money production when placing city tiles.
The only bonus I can see you get are the ones in the text, that is placement bonus printed on place and bonus from placing close to ocean tiles, that is 2 M€ per adjacent ocean tile when placing (a rule I have missed when playing the game).
When you place the tile, you receive the placement
bonus printed on that area (if any). You also get a bonus for
placing tiles next to ocean tiles (see below).
City tile: May not be placed next to another
city (exception: Noctis city must always be
placed on its reserved area). Add a player marker.
Each city tile is worth 1 VP for each adjacent
greenery tile (regardless of owner) at the end of
the game. (Note: the card Capital places the unique Capital
city tile, which counts and scores like a normal city tile, but
additionally gives you VPs for adjacent ocean tiles, as stated
on the card.)