Because I have tried a few, and they are all crap. They are just devices for pushing water about on the floor, moving the dirt about a bit but essentially leaving it where it is and leaving you with a sopping wet floor that you can't walk on as the icing on a particularly rubbish cake.
I'm sure that Lakeland is full of Wonder Mops That Change Your Life (allegedly) but I'm not going to fork out what will probably be £70 for another mop, if it's going to turn out cr@p like the rest.
Any suggestions?