Whether this is cost-effective depends on how many times you can go there a year.

Suppose you go 25 times a year.

58.8 Without a student ID card at one time /48.8 With a student ID card at one time /35.52 yuan for verification of the secondary card at one time.

Apply for ordinary membership card, spend 25 times, and check 48.8 yuan once.

If you apply for a diamond membership card and spend 25 times, check 46. 8 yuan once.

So if you only go 25 times a year, it is basically cost-effective to deal with assassins.

Get a diamond membership card, spend 50 times, and check out 36.8 yuan each time (similar to the second card).

So the cost performance depends on the number of times you go.