Well that's life for hawkers too.. if your food is "no horse run" everyone come from near and far to eat it and you can decide to charge as much as people are willing to pay you. You have just as fair a chance to make it big, own big house and car too be it you are a hawker.
If you are a lazy hawker who keep cooking the same average standard fare or worst have no real passion for it but take over from your parents, your standard over time drops, use inferior ingredients and take less care to improve or expand your range of dishes then you will see patrons disappearing. No different from anyone else seeking to succeed in a modern corporate environment. Everyone from top to bottom has to face the possibility that mediocrity can happen to anyone. heheh.
How many times have we come across great hawker stall that cook so nice we would travel across the island to eat and even if they raise their prices, we bitch but yet we keep patronizing them. heh