We use nested master pages frequently, in order to seperate layout from standard includes and site wide markup, like so:
Site.Master:
<%@ Master Language="C#" AutoEventWireup="true" Inherits="System.Web.Mvc.ViewMasterPage<PageViewModel>" %>
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="language" content="en">
<title><asp:ContentPlaceHolder ID="Title" runat="server"><%= Model.Page.Title %></asp:ContentPlaceHolder></title>
<% Html.RenderPartial("Head"); %>
<meta name="robots" content="index, follow">
<meta name="robots" content="noodp">
<asp:ContentPlaceHolder ID="ExtraHead" runat="server"></asp:ContentPlaceHolder>
</head>
<body >
<asp:ContentPlaceHolder ID="MainContent" runat="server"></asp:ContentPlaceHolder>
</body>
</html>
then have a another master using the Site.Master,
Standard.Master:
<%@ Master Language="C#" AutoEventWireup="true" Inherits="System.Web.Mvc.ViewMasterPage<PageViewModel>" MasterPageFile="Site.Master" %>
<asp:Content ContentPlaceHolderID="ExtraHead" runat="server">
<asp:ContentPlaceHolder ID="ExtraHead" runat="server"></asp:ContentPlaceHolder>
</asp:Content>
<asp:Content ContentPlaceHolderID="MainContent" runat="server">
<asp:ContentPlaceHolder ID="MainContent" runat="server"></asp:ContentPlaceHolder>
</asp:Content>
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