Okay, I don't know what kind of apps you are creating, but you seem a little narrow minded here. If you can't see the benefits of multitasking on a mobile phone, with all the media possibilities, notifications, location aware services etc, well...

What you seem to forget is that 'regular' people DON'T buy and download a lot of apps from their PC's. 3 billion people have mobile handsets. It is in the interest of everyone, both consumers and developers, to enable handset owners to find and eventually buy apps as easy as possible. 'Click Icon, browse, buy' - is SO much simpler than using the phone's browser to browse over to HandanGO's horrible website, fiddle with credit card, download, install, cross fingers.