When I see something like that, I tend to think it's a credit farmer. It's a common practice to transfer credits by putting a cheap item up for a price that nobody would ever buy.
This. Crazy priced items usually aren't that crazy.
I once sold a Republic Banner for 300k because I was actually selling a crystal to a F2Per who couldn't mail credits (but we didn't want someone else to buy the crystal because it was a good price for that particular one).
GTN is a good way to transfer credits to get around the F2P restrictions, although some of the examples here would obviously exceed that and are probably credit farmers.
Not sure about that first one though - a varactyl would be a weird item for credit farming because it actually holds value.