ToxicBunny
Oi! Leave me out of this...
Because a lot of these allowances are probably tax deductible, whereas a lump sum gross salary would not be - at a guess?
Also guessing that some of these allowances are optional - eg you get the housing allowance if you choose not to live in mine-provided housing.
Also, if you try remove the "allowances" and add it to the base salary they will push back.