Children or nieces/nephews due to be gifted or to inherit land often complete the Green Cert. Sometimes it is of benefit, but often it is of no benefit, especially if the intention is to lease out the land rather than farm it themselves.
There are certain tax and EU/Department of Agriculture scheme benefits associated with doing the Green Cert. Of course, there are many other benefits of doing the Green Cert too by providing a mix of theoretical and practical training. However most focus on the tax/scheme savings but these are only available in limited situations.