A proportion of them may get jobs, but nowhere is it guaranteed. And the way the job market is going, I'd say the prospects are looking bleaker every month. Are you prepared to bet another £30k on top of your training costs that you'll get a job at the end of it?
By paying to fly for EZ you give them a commercial incentive
not to employ you. Why should they when there will no doubt be a queue of people prepared to pay them?
As for the scheme not working if people don't get jobs at the end of it - I suspect there are more than enough desperate wannabes who are prepared to roll the dice and convince themselves it will work out for them.
I never thought I'd see the day, but Ryanair's scheme looks positively attractive by comparison.