They have one of the highest budgets in the LOI. Shamrock Rovers would obviously be a bit higher but Sligo wouldn't be far behind.
Sligo finished 3rd in 2010 and 2nd in 2011. They have won the FAI cup in both 2010 and 2011. They have strengthened their squad again for this season and their fans and board expect them to challenge very strongly to win the league this season. This is the environment Kilbane or any other manager would find himself in at Sligo, he wouldn't get a pat on the back for winning a few games as you put it, he will be expected to be right at the top of the league all season.
No if he screws up (i.e. he finishes below the top 3 and doesn't win a cup) he will be sacked and regarded as a failure. Sligo right now is not a job for a rookie manager finding his feet. Much better to start in the job at a lower league club in England that are expected to finish mid table at best and who will give a manager 3 or 4 years to build a squad. At Sligo the new manager will be given one season with a squad already assembled and the transfer window closed.
Your rational arguments have no place on this thread.