This one seemingly doesn't own a catalogue, or a scanner. Virtually every one of their listings is a pricing abomination, including all the common 1d red kangaroos that have invisible cracked electros!
How about Hong Kong 1946 $1 Victory MUH, CV £3.25, listed for $70, or Australia 1961 5d Christmas, CV £0.10, listed for $25?
They've sold 94 items, have 16 followers, and 96.1% feedback. I do despair!
Perhaps I should invite them to join the community so they can learn how to sell properly?