These round the corner jua kali businesses have a niche and what seems to have happened is that 'we' have moved away from their target marked hence 'we' probably don't see and frequent them as much as 'we' used to. But mark you they are still there and serving their target customers. Most jua kali businesses have an intimate knowledge of their customer needs, hence they provide personalized service to their customers.
Irrespective of price, the reason why once in a while I walk into a kiosk to drink a good cup of fermented porridge or cup of soup is the camaraderie I have with the business owner and workers. These businesses know their customers and are quick to greet and acknowledge their presence. They usually also proceed to find out about the welfare of their customers since the last time they saw them, while fulfilling their needs. The unique nature of the relationship between these businesses and the customers differentiates these businesses from the formal sector, and that is why most customers talk in almost possessive terms of their patronage to their respective joints. You will hear someone tell you "let me take you to my joint", followed by a statement that makes them believe their joint is unique.
Even though they are in the informal sector, jua kali businesses are extremely competitive and niche focused. If i ventured to explain the strategy of a kiosk selling porridge, the kiosks core competency is serving that unique cup of fermented porridge, and their positioning strategy is the unique way the customers talk about the kiosk. The kiosks differentiation strategy is the whole shebang (the unique cup of fermented porridge, the camaraderie between the kiosk and customers, the good old wooden seats that have been in place since the birth of Jesus

the good old tin cups or guards, and that extra cup of porridge that the owner will buy you once in a while and charge it to the house)
So what do these small businesses in the informal sector do to compete for your hard earned money and retain your patronage? they develop and maintain long term relationships, while serving you in a much more personalized way either by selling you a unique product or providing you with a service. With one of their key success factors being customer service and retention.
Where do I stand on the jua kali cause? I support the jua kali sector but sometimes I feel I am not doing as much as i should. I think of jua Kali in the following light - With the MPigs (borrowed from a wazuan) are not paying taxes, which collectively with the rest of our taxes would help shore up informal sector and hopefully create more employment opportunities and get some of the youth menacing everyone off the streets, the least I can do is help someone earn a living and put food on the table for their family. I have observed most of the time by supporting someone in the informal sector business you might be by proxy supporting several families. Can you see the exponential effect of that if the MPings just saw a flash of light for a second? or am I over simplifying complex problems?