Its true that one needs to build a product first then worry about the marketing. I just happen to grab these two domains so I kinda skipped the product part first.
Would I be right in thinking that you were expecting a more general approach to finding an idea for them than you got? I thought they were quite harsh for something that could, for all they know, be as much a learning exercise as a business venture. I'd've grabbed 'em too, if I'd come across them :)