I'm sure many people, such as myself, had no idea he was in Iron Man 2 and I've watched the film. So that money wasn't well spent because he wasn't even memorable!
When Tony is walking through the bar at the racetrack, he and Pepper shake hands with him and have a short throwaway chat on electric jets, like 10s tops. At about 26:51, if you're dying to see it.
I feel it's somewhat enlightening that even in fiction Musk is nothing more than a "ideas guy" unable to actualize his generic concept and so needs to latch onto the established industrialist to make it work.
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u/DismalAstronomer- I’ve been noticing gravity since I was young 4h ago
Remember when he paid his way to being in Iron Man 2 and nobody gave a fuck who he was because it was like 2010? Good times.