We hear of company mergers but I have never heard of forum mergers . Have you ?

This question crossed my mind several times when I saw decent like-minded forums. Some are very small ( in membership and number of posts). The question was : wouldnt it be nice/efficient to pull resources together and be all in one forum ?

Have you seen any forums that merged ? I mean members of both sites joined in one ? Was it good or bad ?

Off course, I don't mean merging a civil prep forum with a volatile hyper survivlist type forum. This discussion is about two similar forums that are similar in policies and direction. Is staying apart better or is merging a not-so-bad idea ?