There comes across a sense that Yahoo is now discriminating against small sites that can't afford the Express submission fee. There's also a sense that Yahoo owes something to these small sites. After all, small sites form the bulk of Yahoo's listings, and links from small sites across the web give Yahoo serious grassroots traffic. There's some element of truth here. But to be fair, Yahoo has not removed its normal submission process.
Sites can still submit for free the old way.
There is no excluding going on that is new. Business Express offers an avenue exactly for that person who feels they were excluded before. It can even be argued that Business Express may help the normal system. Yahoo says new editors for Express are funded out of the fees collected. That means the old system hasn't lost anything in terms of editor power.