The competent and intelligent are loath to waste their time. Eventually the ablle are replaced by the available.

In far too many associations meetings are carried out in such a way that there is a high wastage of competent committee members and their replacement by those with high tolerance to ideocy. The competent and intelligent are loath to waste their time month after month attending hours of meetings that achieve very little. Eventually the able are replaced by the available. (John Milligan, 'The Penguin guide to chairing meetings', p12)