We just this last month did the very same thing. We had 45 or so members at Peace Haven CC, Mozzville International had a bout the same. We both were tired of the only 15 or so from each club being counted on to play. So we merged and formed New Haven CC.
We weeded out about 1/2. Now our membership is at 58. Seeing 45-50 members playing each tournament is a fun thing :-)
One of the leaders of our club was previously in the one we merged with, she was friends with them all. It made the transition very easy. Something you might consider, if there is another club that would like to merge, send one of your members to them for a few days, they can do they same. Each club will then have a good understanding of what you both do.