Hi brewer, welcome to the site (I can't believe no one registered that screen name until now).
Cask is a lot more trouble for the publican. It requires skill to tap a cask and judge when it's ready to be served. It also has a very short shelf life once it's vented, so you can end up with wasted beer.
The average Irish publican wouldn't know a hard spile if you were tapping it into his navel and with keg beer he doesn't even have to clean his own beer lines, as the brewery will send someone round to do it for him. Why would he want to take on something as troublesome as cask? Why would you want that foreign muck anyway? Is Heineken not good enough for ya?