this post from internet monk refers to a post by justin buzzard @ his blog called, “the top 10 reasons why people should not join our church plant.”
the 2nd of the ten is "if you're a christian and you don't like your current church (you will find reasons to not like this church).
although I think it could equally apply to any church not just a church plant.
indeed coming from a small village church (cofe) i've often wondered what the analysis would show if we asked all churches in the diocese to share info on the post codes of their electoral roles and/or membership.
i suspect it would show the larger more popular churches attracting many from way outside their parish.
maybe instead of welcoming such brothers and sisters they should challenge them to go help make christ real in their local church.