It really depends why the league is with BoxCast. There's a possibility they genuinely think it's good for exposure rather than something that brings in income. Maybe the ADs really like their sliver of that pie. If income is even in the cards, most of the money surely goes to BoxCast -- typically it's something like a minimum fee is paid to BoxCast for the streaming equipment and support, then any profits over a threshold are split. It could be simply the plug-and-play simplicity of the system. All BoxCast does is supply a little... box... that plugs into the school's provided camera. There's some support and recommendations for cameras and settings, but nothing is "produced" by BoxCast. This is really what makes it frustrating for groups like RPI TV and likely WCKN which aren't directly affiliated with a school's athletics department.
I don't speak for RPI TV (anymore), but the resources certainly aren't there for additional "productions", however there's quite a lot of know-how about how to stream for free, and RPI TV has a second, single-camera with graphics setup that could be duplicated and exported around the league with a lot of work by the RPI TV guys and some instruction to the home staff. Pack Network evolved out of Northeastern's video efforts and could be a model for RPI TV or loosely affiliated exterior business venture.
Ultimately, I think it's lack of resources (read "laziness") and lack of vision from the ECAC that lead to this issue.