20M shares bought at an average of .0006 = $48K profit at .0030.

50M shares bought at an average of .0008 = $210K profit at .0050.

I'm not suggesting anyone could necessarily sell 50M at a single price in a single day but rather the advantage of holding a large inventory of shares to trade on future runs and not worrying too much about the cost of achieving that on stocks like $DIGX when future repeat runs are likely for the foreseeable future and the bottom price achievable each year is likely to move up after each run. Hence the importance of not selling the "biggest bang for buck" shares at the cheapest few levels until investment / profit goals are met.

Just my way of doing things which works out well for me.