No matter what your income, a certain amount will have to be set
aside each month for necessities like groceries, transport,
utilities bills, etc.
Depending on the amount you have after all those compulsory
deductions, you may or may not have enough left to save.
And of course, under groceries, if you always pay top dollar for
'premium' products, eg. the most expensive brand of rice, soya
sauce, etc... then your expenditure will increase accordingly too.

I've saved a lot since moving back to my parents' - no need to buy
any more toiletries, toilet paper, tissue paper, detergents, soap,
toothpaste, etc!
Sounds trivial but it does add
up considerably! 