This looks like its a low cost business operation with low barriers to entry. All you need to do is find a decent tree under which to display your wares.
The reality is that these entrepreneurs have numerous fees and costs that they must pay in order to do business, regardless of how informal it all looks. They pay rent for that space on market day, they pay the council in order to transport their wares, they need to pay for transportation, and any assistance they might need for loading and unloading, they even need to pay the various formal and informal “tax” collectors on the road to this market town.
There is a cost to doing business, and there’s uncertainty of income and cash flow. Some of these fees might be fixed or known, but some, like the amounts asked for, along the way, might be dependent on the mood of the officer, or even, the weather.
On the other hand, these fees and taxes and payments ensure that the retailer has a decent location in the market, that they won’t be harassed or chased away during working hours, and that the “system” – chaotic though it might seem to our eyes – will serve their needs.
If you were ask them what they think of this, they would shrug their shoulders and tell you its just the cost of doing business.