Maybe one reason is: Let some retailers think that it bounces and lure them to buy more shares BEFORE we crush "dat thing" again!?
If it falls below $1.00 it will probably trigger many stops and scare more retailers off... so why not playing this game a bit longer by keeping it above US$1.00 for some time? ;-)
Just IMO of course... at least that's what I'd do if I were MM and should look for a way to rip of ppl