system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Why doesn't Tony Stark (A.K.A. Iron Man) build a suit out of adamantium?

Tony Stark, perhaps better known as Iron Man, has access to a vast wealth as head of Stark Industries. In fact, he is one of the richest men in America. As such, he should be able to obtain a vast amount of adamantium or even vibranium. Yet, despite the repeated destruction of many of his suits, he does not utilize these metals in a suit. Why is this? Wouldn't an Iron Man suit made of adamantium be virtually indestructible?
gpt
There are a few reasons why not.

1. Adamantium is a tricky material to work with. Once you refine it to it's liquid form you can mold it, shape it and forge it to the components that you need. After it sets it is nigh impossible to reshape.  
Once Tony made a suit of adamantium there would be no way to modify it. Tony would be stuck with one suit that is invincible, but everything else about would quickly become outdated, the repulsors would have a limit of how far he could upgrade them, the boot jets, flight controls, onboard weapons would all be locked in.

2. Adamantium is incredibly expensive by weight to ~~mine~~synthesize, refine and work. Tony is a business man, he sees the costs of the material, and while there is an upside to the survivability of an adamantium suit, there is a point of diminishing returns for the materials. If he has a carbon-nanotube/iron matrix that will do fine for 98% of the time, is the exponential rise in costs to the adamantium suit worth the investment to cover he last 2%?