As in any close relationship, sometimes one or both partners becomes dissatisfied. In places where only one company purchases wood, they often take advantage of their monopoly power to drive down the price. Farmers don't like that. On the other hand, in places where several companies compete for the same wood, some farmers may get credit and technical assistance from one company, but then break their agreement and sell to another. Companies don't like that.
Planting trees is a risky business.
Prices and policies change and companies go out of business. Some trees grow poorly. Pests, diseases and fires plague others. Companies and farmers would both like the other party to bear as many of these risks as possible. Overcoming these problems requires clear communication and a long-term commitment to making the relationship work.