Would coins be a good investment?

If I bought 2006 silver eagle proofs.
or if I bought 2006 gold eagle proofs?
Back in 1991 I bought $100 worth of non-proof silver dimes/half-dollars last week I sold them in the rich part of town. She gave me $100 for them So anyway would proof silver/gold coins be a good idea? Any help would be great..Thank you!

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2012 AMERICAN EAGLE - 1 OZ. SILVER - PROOF - READY TO SHIP!!

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• eBay Ending Soon:

  2012-W Proof American Silver Eagle $1 NGC PF70 PF-70 Ultra Cameo First Releases $109.00 1d 12h 14m

  2006 P NGC PF70 20TH REVERSE PROOF AMERICAN SILVER EAGLE COIN $408.00 16h 32m

  2006-P NGC 20TH ANNIV. REVERSE PROOF 69 SILVER EAGLE BEAUTIFUL SPECIMEN $214.62 14h 47m

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