I think they want to scare people away (to sell @ 2 XPM to them, where they are waiting with their bags open). Basic tactics. Hold on people, don't get fooled...
For sure is like you say

lol one person i saw it

did over 4000 xpm

he will delete it fast then they will start dumping

soon will come his friend and will make wall bigger and then people will sell at 2 after that price will explode
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edit -
People look at now

his friend came and making wall bigger

next 4000 xpm to make wall 8000 xpm lets see
I wish I had that kind of money...
If anyone notices a big pump, please post it cuz I really don't wanna miss it.