Personally, whatever the income is, as long you can consistently put aside 30% monthly, untouched under no circumstances (except for retirement/child's education/emergency medical needs), then just buy whatever fancies you.

Maintenance and repairs should be taken out from other savings (not your 30% funds). Heck, even holidays also should not touch that 30% fund. But that's just me.

Just know that different folks have different priorities in life. We ain't here to judge if it's right or wrong for you. As long as you're comfortable with your buffer. Out of RM9k, whether you're comfortable with a buffer of RM3k excess a month, or RM500 a month, that's really for you to decide.