Buy a regular sports car? When I picked up the car, I discovered that it was a global limited edition/comes with top-level modifications/comes with lifetime free top-level maintenance.
Skill Lighting: Spending huge sums of money to book a top-notch restaurant for a good meal? Unexpectedly comprehend [God-level taste buds] (can taste the source of ingredients and the chef's mood) or [Top cooking skills (limited version of home cooking)].
Encounter with people: casually tip a huge sum of money to an elderly performer on the roadside? The old man turned out to be a master/reclusive expert in a certain field, and he took the initiative to make friends with him.
Event modification: Spend money to buy an island for vacation? Happened to avoid the troubles that would have been involved; the investment project seemed to be losing money? As a result, the policy turned out to be favorable and unexpectedly reversed course (not a conspiracy, just luck).
"Sparkling" special effects: The money the protagonist spends (banknotes, transfer records, etc.), From a specific perspective (or the protagonist's perception), will briefly emit a gentle golden light that only he can see - symbolizing that the money has been "activated" by the system's lucky attribute. This is the origin of the title of the book, and it is also an interesting setting for the protagonist to judge whether the money spent is "worth it" (for the system).
