Thinking out loud ... For people to sell, they have to own (so I leave aside shorting - I will assume if people are smart enough to short a sub-penny stock they're smart enough to know when it's financial suicide and would leave UOIP alone).
So if legit retail shares of UOIP are still selling at this juncture, the owners were smart enough to buy but not smart enough to understand what they bought. Or maybe they feel there's a more compelling play and need to sell UOIP to fund it. This is plausible - 1) either sellers are not too bright or 2) they calculate that immediate funding for another stock outweighs near-certain future wealth settlement will bring.
That leave MM's exchanging shares between themselves as potential "sellers" - but they're not selling to retail, just making a market or the appearance of a market. Some call such low volume walk-downs manipulation or worse, but it may serve their interest in tamping down interest when even mild volatility could outstrip their ability to distribute shares due to a potentially locked float.
