It depends on what one means by "so much money", since that's sort of subjective and open to interpretation. If I have already made $750k on this scam, and I still had a few million shares to dump, then sure, I might throw in $25k-$50k to give the illusion of interest. Other's have done it. I've watched them. I've watched CEO's and VPs buy a combined total of $100k+, just to dump it all back.
SWET, I think, still has some holders of debt that would like to convert. The CEO may be trying to help them out.
Think about it. If they know something (and that is what everyone attempts to imply) and they trade on it before it's common knowledge, then it's off to jail they go.