I like the concept of looking at membership revenue by channel, as is an option in the Membership Dues Revenue Report, however it needs a couple tweaks in order to be a helpful report.
"(no channel)" category is misleading. It currently includes back of house transactions where no channel is recorded, Daily Sales, and Online Sales. Membership sales in Daily Sales and Online Sales should each have their own channel. The two sales methods are very different and should be tracked individually.