The shop system in my Pygame game does not decrease the players money

Question

So I am making an idle clicker game in Pygame. I wanted to add a shop system where if you click on a cursor, you can buy a cursor to click for you. So here is what I wrote:

if event.type == pygame.MOUSEBUTTONDOWN:
    if cookie_rct.collidepoint(event.pos):
        points_from_clicking += 1
    if cursor_rct.collidepoint(event.pos) and final_score >= 10:
            cursors += 1
            final_score -=  10

What happens was that instead of decreasing the player's score upon purchasing, the amount of points the player has will only increase.

Full code:

import pygame
pygame.init()

screen = pygame.display.set_mode((640, 640))
clock = pygame.time.Clock()
mouse_pos = pygame.mouse.get_pos()
points_from_clicking = 0
cursors = 0
start_time = pygame.time.get_ticks()
game_active = False
font = pygame.font.Font("PixelType.ttf", 75)


#code for displaying score
def display_score():
    global points
    global present
    global final_score
    present = (int(pygame.time.get_ticks() / 1000) - int(start_time / 1000)) * (cursors * 1)
    final_score = present + points_from_clicking
    score = font.render(f"{final_score}", False, (0, 0, 0))
    score_rct = score.get_rect(center = (320, 60))
    screen.blit(score, score_rct)


backround = pygame.image.load("graphics/backround.png").convert_alpha()
backround_rct = backround.get_rect(topleft = (0, 0))

cookie = pygame.image.load("graphics/cockie.png").convert_alpha()
cookie_rct = cookie.get_rect(center = (320, 320))

cursor = pygame.image.load("graphics/cursor.png").convert_alpha()
cursor_rct = cursor.get_rect(center = (320, 580))

#gameloop
run = True
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        if game_active:
            if event.type == pygame.MOUSEBUTTONDOWN:
                if cookie_rct.collidepoint(event.pos):
                    points_from_clicking += 1
                if cursor_rct.collidepoint(event.pos) and final_score >= 10:
                        cursors += 1
                        final_score -=  10
        else:
            #code to start game
            if event.type == pygame.MOUSEBUTTONDOWN:
                cursors = 0
                points = 0
                present = 0
                final_score = 0
                game_active = True
                    
    if game_active:        
        screen.blit(backround, backround_rct)
        screen.blit(cookie, cookie_rct)
        screen.blit(cursor,cursor_rct)
        display_score()

    else:
        #Main menu
        screen.fill((255, 255, 255))


    pygame.display.update()
    clock.tick(60)