The expensive scuttles look great, but I don't think they're necessary to make good lather. l.
Im no scuttle expert, but i dont think the main reason for having a scuttle is the quality of lather... I think a scuttle is prefered by folks who wish to keep their lather warmer... longer. the lathering area of most scuttles is no different than most mugs... the diference is the "bottom bowl" and the hot water it holds to keep the lather warm..
I could be wrong though!