The conclusion here (to paraphrase: "no DRM isn't a big enough draw") doesn't seem to be at all supported. It may be that they want to focus on publishing; it may be that they simply had to charge too much; it may be that it wasn't bringing in enough sales to make it worthwhile, compared to other retail channels.
Without more data (or really... any), this conclusion is pure speculation.
Without more data (or really... any), this conclusion is pure speculation.