Good for developers that we keep updating programs?

Developers such as apple for itunes or even iphone IOS systems, the ones behind skype etc.
why do they want us to update the programs so badly? What do the developers gain from updates?

They update to fix issues that users have reported and to work with new operating systems. If they didn't fix issues as they are reported people would stop using them.

  • Will updating my iPhone apps affect my phone speed as how updating the Operating System (OS) will? Currently I'm using the iPhone 5s on iOS 8.3 I know if I were to update my phone to the latest OS I may notice some slowdown on my phone's performance, since it may not have the "muscle" to handle certain functions. Many apps now are optimised for iOS 9 and/or the 6th generation phones. Will my 5s' speed performance slow down if I update my apps? Will the app's performance slow down?
  • Will Apple brick non developers running iOS 7 beta? I just downloaded the I0s7 to my iphone 4S… I didn't pay and people are saying my phone will brick if i keep it! But some people are saying no it won't! Does anyone know!
  • Where to find experienced APP developers? I'm looking for experienced app developers for Iphone and Apple Watch and can't seem to find a website that would be trustworthy. All the websites that I've been to is full of people from Asia who could easily steal my idea, please tell me a good website that offers Iphone app development
  • What does For Developers mean? So recently Apple released an iOS 7 Beta version and it says "For Developers". What does that mean? Can i get it for my iPhone 4?