Question about the sale of a mobile home: why is a campsite manager automatically entitled to a percentage of the sales price for each sale of a mobile home?

Owners of mobile homes, in application of their contract with the campsite manager, are often obliged, when selling their mobile home (even if they sell it to another owner on the same campsite), to give a percentage of the selling price to the campsite manager. If the sale was made possible through the mediation of the campsite manager, this may seem justified. Very often, however, the campsite manager does not play any role in the sale. In that case, this arrangement strongly resembles unjustified enrichment. Individually, there is little that campers can do about it. With TWERES, however, we can work together for balanced model contracts. An example of model contracts are the RECRON conditions for permanent pitches that have been worked out for campsites in the Netherlands.