Well, I used my 200 coins for those reasons:
- chainmails, blessings and 2h30 sundials are good items;
- rarely the IS are to be found in the everyday lottery so I get the maximum of them when I can, (that's why I saved and bought so many tokens)
- I like putting them on : Rallypoint, Palace, Apothecary; as I did for my 4 actual cities (My technologies are all achieved). This alone requires 12 IS (had 9 left in my inventory prior to the lottery). I'll now be able to put some lvl10 barracks as well for the ballistas; got already 2, might add 3-4 others in the long term.
Now, all tokens spent and all projects secured; this leaves me 8-9 IS. What to do with them? Might use 1 on a 2nd ambassy and put a 2nd wall defenses as well on that city. I still got no museum, no colosseo no market and did not spend any on watchtower, so I'll save 3-4 if something evolves about these points. With the 3 remaining IS, there are still the forge, stable, relief point, workshop; general quarter, villas that can be improved (not to mention any new building that might appear), I know I'll find a good use for them and spend them happily . If I'll berunning low of tokens for the next lottery, I'll buy some fortunas chests if I find it worthy.