Based on your post you want to increase CTR? As you know CTR is only a small portion to the profitability of a site or campaign.
But in terms of WordPress themes you need something flexible, SEO ready, and flat out easy as shit to launch. But wouldn't it be cool if they made skins for theme frameworks instead of child themes? Take a base theme like Thesis or Genesis and instead of installing a child theme you just install a skin to set your base for your landing page using the same framework. No more dicking around with finding themes to match what you want.
I can not think of any easier theme to do this than Canvas by WooThemes. With Canvas you can design your own landers and export to other projects. You don't even need to know any coding to do this but it does help. Hell I recently launched a site just for this reason called
Conversion Canvas.
The site is still in its infant stages but by looking around you should quickly realize that Canvas is the shit. All skins are designed using Canvas options inside the wp-admin. Like I mentioned the site is barely ready as I have many plans for tutorials and other shit but Canvas is the ultimate internet marketers theme. Unlike CTRTheme.com or other high CTR Themes the entire WordPress functionality is at your disposal.
Taxonomies, Post types and conditional tags are the shit to quickly launch a robust lander efficiently.