blocking sells on the sell side

somebody has started stacking the sell side of the quotes with a set of good sized set of blocking sells. it happens each day prior to market opening. later in the evening when I check the my stock quotes the blocking sells are gone.

i think the strategy is trick potential sellers into selling down their stock at a price lower than they normally would have. hence they are able to achieve their aim of buying the stock they want at a lower price.

8/8/2013 at 10.30 pm est. the only three sells left after a number were removed are -
59c. 25,400
69.5c. 2,500
75c. 10,000
lets see what appears tomorrrow morning.

GK.