I see No FG's go for $10 each and impared proofs anywhere from $2 - $3 each. NIFC are often 75 cents to $1 but to me $1 is not worth the trouble. but $10 for a No FG, to me is selling at a profit,
however that being said if I look at the time involved what you need to profit is, Trip to local bank to order boxes 1/2 hour, pickup boxes 1/2 hour, go through two boxes 3 hours, return boxes to two to three different banks away from local area 1 hour. So I spend 6 hours for every two boxes, at minimum wage here that is $66, less taxes withholding etc, it is about $40, that mean to show a profit you need 5 90% or 13 40% to break even with what you would make at McDonalds (actually around here they are paying $12). So a skunk would be less than 5 90's or 13 40's if it is about a profit.
That being said I always felt that a skunk was no silver, however I now feel that a proof that could be sold for more that 50 cents (most of them) or a No FG keeps it from being a skunk.
I will be seeing if I can sell my Proofs at the next gun show I am displaying my collection at at the end of January. I see them selling for $2-$3 for circulated proof on Ebay, not asking selling. So I will put them on the table for either $2 or $2.50 or the really nice 1976 I just got for $3 and we will see what I get.
If you only get one 40% that is $3 but a nice proof is $3 or a no FG is $5-$10 I guess to me a skunk is no Silver or Proofs or missing FG's