Hey, I'm new to this, so maybe this has been answered but I couldn't find it.

So here's my question: Why doesn't Doom (or Stark, for that matter) make their armor out of adamantium.  I know Doom's isn't (Sentry couldn't have ripped his mask off if it was).  And I'm almost certain Victor could afford it.

Doom made his Armor out of several materials to simply infact all the possibilities he can to not be harmed, for example, Adamantium, wolverine has adamantium and can EASILY be thwarted by magneto, whom doom also encountered and knows of, so, Basically his Armor consists of a long range of diffrent materials in an anti-magnetic structure.

Iron Man on the other hand needs a light structure to stay airborn and together with "Extremis" its another advantage as for manuvering. Think Starks current armor consists of diamond or something.

Well, why not Vibranium? (Is that magnetic?)

All Metal's are magnetic in a way or two but the trick is to anti-magnetize it. Thus, we never really know what dooms armor is made of, since the rough description only says"alien metals and other selected ornaments" bladiblidibla, believe me, if Doom thought Vibranium for a good idea he'd have it built in, if he didn't then he didn't.

Here's another thing he's got built in just in case you don't believe me.

So here's my question: Why doesn't Doom (or Stark, for that matter) make their armor out of adamantium.  I know Doom's isn't (Sentry couldn't have ripped his mask off if it was).  And I'm almost certain Victor could afford it.
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It would seem redundant after Ultron.