Strange game imbalances
I believe the problem with BG's is evident everywhere in the game.
Take a look at the following:
Farm upgrades produces increased production up to level 17 with each upgrade being more than the last (which makes sense)
Upgrading to 16 gives +400 p/h
Upgrading to 17 gives +600 p/h
Upgrading to 18 gives +400 p/h
Upgrading to 19 gives +500 p/h
Upgrading to 20 gives +500 p/h
Mines and Town houses also seem to become less rewarding
Upgrading levels 6 - 16 gives +20 p/h
Upgrading levels 17 - 20 gives +10 p/h
Selling equipment of different class and rarity is strangely formulated !?
10 coins takes 7 min
30 coins takes 1 hr
60 coins takes 3 hr
90 coins takes 15 min
100 coins takes 6 hr
Making 1 Necromancer takes over 1.5 hrs
Losing 100 Necromancers in BG takes 1 min
This is just a few examples, there is definitely more...
Point is, that for #7YearsStrong this should not be a problem at all any more?! What is wrong with keeping the gain ratio?
Fix the imbalance (especially in BG's), and ask less for Buying and Using Sapphires.
PS
Asking less will DEFINITELY ensure more sales