To remove Podium from the Mac - use the Mac uninstall that we wrote.
http://www.suplugins.com/help2/mac-uninstall.php

But if you want to remove it manually, it's located here:
acintosh HD\Library\Application Support\SketchUp 2014\SketchUp\Plugins\

Remove these files and folders
SU_Podium_V2.rbs
SU_Podium_V2 folder
SU_Podium_Browser.rbs if it exists

The problem you are experiencing, where you have to resort to Force Quit to quit SketchUp with Podium, is not unique. I'm also needing to use Force Quit often. This started happening with 2013 and has not gone away with 2014 on both Mt. Lion and Maverick.
We are trying to figure this out. Sorry for the pain.

Sorry for the problems you are having.
Here's a quick way to remove SU Podium V2 or V2 Plus
Download the uninstall program here - http://www.suplugins.com/help2/mac-uninstall.php
We only have this because Maverick tends to hide system folder and files.
If you want to remove Podium manually. It's located here:
Macintosh HD\Library\Application Support\SketchUp 2014\SketchUp\Plugins
The file you want to remove is SU_Podium_V2.rbs and remove the SU_Podium_V2 folder.
There is an issue with not being able to close SketchUp 2013 and 2014 with Podium. This happens to me of and on with Maverick and Mt Lion. I have to use Force Quit. I don't know why this is occurring. We are still trying to figure this out. I hope use Force Quit is not too much of a pain.