What do the letters mean in my numbers?
They're si unit prefixes: Number Suffixes
Why are the buildings so random cost efficient? My Oil Sands costs more than 50x Saudi Field :(
The rate of increase is variable because different investments have different economies of scale. For the early part of the game, the initial cost of a property is the most important, but later the multiplier becomes most important. The multipliers are listed here: Level Cost Increases
Will there be a Buy 100x option? After the new update i Retire every hour and it's kinda annoying if i have to click up to 800 with 10x on every building
We weren't planning on it, but this has been requested several times, so we may add one in the future.