.com domain for a million-dollar company/brand

Guys please help me figure this one out, i am really getting too many grey hairs on this one.
I have a .com domain that is an exact match to an internet company /brand that is worth about $1-1.5 mln imho. About 2.5-3 years ago it was bought by a very big media company for 0.5 mln, and I think they spend quite a bit of money on propping this thing up, advertising, etc.
Recently they sold it to a small company that was a competitor of that brand in its niche, I don't know what was the price but…
.com domain for a million-dollar company/brand

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