I think  that Plarium would make more money having Fire Balls on sale especially during PvP's. I know I certainly would be more likely to spend my Sapphires on them if they were on sale 

lady chill i dont suppose you spenting saphire on fbs is very expensive.

only if you are money player you can do that once fireballs do small damage and worth very much as you say.It is expensive so only money players have the flexibility use it to make realy  damage.

also abut pvp no worth the fbs, if you think it worth to spent 250  or 500 saphire to win 100 pvp s no worth :)

i think you can give property about how you can spent your saphires on

1.  on walls
   
2. a group of thieves to raid inactive castles fast
3. upgrade of infimary

i post friendly although in the game you hate me i have no any bad intetion

plarium makes enough money off of us. 

use troops for pvp even at 50% off 250 saphs for 380ish pvp is not a great deal

you would be better off building some troops and sending them somewhere to get your points

Fireballs are only good for warnings.