Unless an app is removed from the App Store by Apple for violating App Store guidelines, the decision as to whether or not the app will remain in the App Store is up to the developer. Since those apps are still in your App Store purchase history, they were likely removed from the App Store by the developer.Weird, I found Let's Golf, and Let's Golf 3 on my 'purchased items' list on my pad, and was able to download them. They work fine. Makes no sense that they are no longer available. Most of the new golf games are utter garbage.
I did find Real Golf in my old purchases and installed that, but it wouldn't work.