Not sure why anyone would have angst over the current size of these events... I haven't read enough on this site to see how prevalent those opinions are... was just cruising through yesterday and saw this full ride topic.
The reason value remains even with large talent disparities is - going into the event the organizers mostly know where the talent is, and what teams are there to help fund their event.
The teams known to have higher level talent will more often than not get scheduled prime time slots... these teams have a fairly straightforward path to the later rounds. This allows more pitchers to be seen, and more at-bats to be had. More prominent programs get more opportunities to showcase more guys.