Could you start listing your updates in the updates tab, next to the Instructions and Descriptions tabs? You're taking up all of the top comment spaces
It's at around 280-290 that everything except the lemonade stand becomes the same price as the oil rig, despite making negligible amounts of money. Past that, banks are more expensive to build than oil rigs, movie studios become more expensive than backs, etc, and newspaper outlets become the most expensive thing of all
You can reset the game and start over, except this time with more angel investors. For each one you have, you earn 2% more money from businesses than you would without any
As soon as you start up again after the update, make sure you buy one of everything, the achievements you've earned for particular buildings are disabled and you need to buy one more to get them all back
 "My Friend Pedro")
 "StrikeForce Kitty")
 "Idle Mine EX")
 "AdVenture Capitalist")
 "Dangerous adventure")
 "Bullseye (Interstellar Marines)")
 "Elona Shooter")
 "Tyrant")
Bam! Well done! Save'em up, because you'll probably be spending them soon...