Hmm ... interesting that you believe site is just glorified App Store page. You are missing the opportunity to educate and converse with your target audience. Think of app as a product and site as a marketing, education, support, and community channel.
I only have experience with iOS App Store. Things, I always find missing pursuing apps in App Store is decent amount of information about app and typically land up on developer website to learn more. I invariably ignore apps (especially paid ones) that don't provide enough information. You can't make me write check until you convince me that your product is what I need or want.
If someone is coming to your site, they most probably either trying to decide whether to buy your app or looking for support or to learn more. Use this opportunity to engage with your prospects and customers.