This is partly corporate greed and partly a failure of the Web. A website should be all you need. You shouldn't need a separate app for every little thing.
It's not a failure of the web, it's a failure of corporations to accept their place as just a tab in my browser. It's also easier to track users, exploit vulnerabilities, etc. from within a mobile app.
If all I'm doing is looking at your catalog, it should work in a mobile browser. That way if I - a Tarheel - find myself in the midwest, I can go "does Menards have 1/4-20 hanger bolts?"
I'll install an app if it runs mainly on my phone, like a media player or a calculator or maybe even a file viewer. Mobile games...that ship has sunk, frankly.