If a developer wants to get paid, they have to make sure people pay for it. And now we have DRM. The goal of DRM is to make piracy annoying enough that the path of least resistance is to just buy the game.

You're assuming the only options are no DRM and voluntary payment, or DRM and mandatory payment. You can still have a normal storefront and actually ask for money, and still sell games (or software in general) without DRM. GOG does this, for example, and they're doing fine.