In deed, my strategy seems to be better - buying low, selling high.

So if someone is really following the strategy of selling down, there could be more behind than earning with the trade of shares.

In deed a big competitor could try to harm POET. Reading some of these awful posts at SH (yes, from time to time I get my feet dirty there) and seing the short position at this low level, conspiration is one minor possibility to explain the SP.