I got the T5P because wasn't sure if I wanted a closed or an open. The closed will have its benefits for me in making me a quiet listener so I wanted to try the best of both worlds - especially since I'll be using them while traveling. Anything closed and really good will have an advantage over open, but the open have an advantage just by the sound of being open so I had to see for myself what exactly the trade off would be.
Haha, don't worry - I'm not crazy. At the most I will only keep 1 amp + 1 open pair + 1 closed pair, but I might not even keep that much. It was closer to $11,000 anyway!