Indeed I wouldn't sell mine for $1000 each either right now although mine are still in a sealed box. I think people underestimate this set and are comparing it more to the 20th anniversary set as far as value, but the mintage is far less on the 25th set.
Certainly the melt value of silver was much less 5 years ago, but I believe the 20th set sold for $100 per set, and is now valued at roughly $325~ for a raw set. That is for a set with a mintage 2.5x higher then the 25th set. Say this set appreciates roughly the same as the 20th set at approx 3.5x issue price that puts raw sets at approx. $1050 per set, and that does not even factor in the lower mintage.
Also a quick scroll through the Ebay completed listings shows that NCG/PCGS graded sets of MS/PF70's have recently sold for between $1500-$2200, or 15x-22x issue price. Translate that to the 25th set and the MS/PF 70 sets would be worth $4500-$6600 EACH. Now do I think they are going to get that high? No. But I believe as the supply dries up (which it will) we will see a fairly significant price increase in the 25th Anniversary set, regardless of any future releases from the mint. They only made the 2011 for 1 year, and only made 100,000 of em.
Get 'em while you can~