It is important to keep in mind the total number of shares outstanding. As investor David Ryan says, looking out for 30 Million is an idle quantity. I mean 40-50 should not be a problem.
The logic behind this less volume outstanding is that the less the volume, the more tight the demand is. The demand rope is tight. There are less number of shares and when ever people get interested in the stock with such a quantity, the stock jumps and leaps.
Look at HWK, it has only 7 Million stocks. Also such stocks have a high chances of splitting.