According to this table
at BP from '01, the Yankees $56M TV contract was about 10x larger than the Brewers $5.9M deal and over 100x larger than the TV-poor Expos minimalist deal. (Reading this table, it's a no-brainer why the Expos left Montreal.) The Reds were at $7.8M, about 3 slots above the Brewers.
I wish I could find something more current.
While looking for a table like this, I saw some speculation that MLB's hidden agenda in centralizing its Internet streaming sales is to eventually share the revenue from that centralized operation. It could move away from broadcasting altogether, in favor of selling game audio and video directly to consumers.