I posted this the other day, I think it applies here as well.
The way I see it, selling 40% halves and War Nickels for cash is like reinvesting a stock dividend or compounding interest. I keep all 90% to build my stockpile. The 40% are traded for gold, .999 silver, Morgans/Peace dollars or cash, but mostly cash. Most of that cash goes into my CRH bankroll, allowing for greater volume, which in turn leads to more silver. This formula has served me well so far. I started with $500 in CRH bankroll in April of this year. So far I have turned that $500 into $3000+ bankroll, 15 grams of Gold Bullion, 1 gold half-eagle, 30 Morgan and Peace Dollars, 10 ASE, in addition to a considerable stack of 90% from CRH.
I traded $300 face value of 40% from CRH for $2800 and a 1914 $5 Gold Buffalo Head a couple weeks ago. $800 went to paying a credit card bill (instant savings on 12.99 APR card), and $2000 went to my CRH bankroll. I figure that that $2000 has earned about $700 in silver so far, whereas the value of the silver would have increased about $250 in the same amount of time, so I am ahead.
Now, there are negatives with this. If you trade to a dealer, you are likely giving up value on both ends of the deal. I get between 85-90% of melt for 40% and pay have to a 5% premium over spot for .999 and gold. I liken these losses to brokerage fees, its just part of the game. You got to pay to play!