EK offers it's pilots a good package as compensation for having to live in the desert, they want a certain standard of applicant and have deep enough pockets to offer enough of a deal to get the people they want.
Scoot can't match EK's package but might be more attractive to someone who doesn't fancy the sand pit, or someone who wants to get a couple of thousand hours on the B777 and try his luck as a direct entry captain somewhere else. It could also do as a retirement job.