Why do Singaporeans like to drive into JB?

Summary of my trip yesterday.

Drove into JB through Causeway, no traffic jam at 11am.

Had lunch at Ah Seng steam fish, 2 fish + 2 veg + meat (pork belly) + drinks - RM110. for 6 pax.

Went to Bt Indah. Massage at Eminent (clean) - 2 hours massage, cupping and ear candling - RM168.

Wash & Hair cut - RM38

Made glasses - Nikon lens / some scratch proof glass / normal frame / super high index lens - RM400+ vs S$400 in SG.

Bought contact lens

Grocery shopping - veg, some seafood, furits and grocery for a week.

Coffee and donuts @ Jco

Other snacks and tidbits.

Dinner - 2 frog (kungpoa) + 2 frog (ginger) + meat + veg + otak +egg +drinks RM100 for 6 pax.

Filled my petrol tank - RM57 about < 1/2 tank.

Reached home at 8pm - no traffic jam.