I think the crazy prices are coming down.
I saw a Colt Sporter selling for $900. But at the same page, I saw someone peddling a New Frontier complete lower plus a PSA upper for $1500.
I'd buy the Colt if I needed one.
To answer part of your question, sell it if you are not going to miss it. Price is dictated by the market. Check your LGS to see what they are selling theirs for.
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