If you can do it well, and find band members who are as committed as you are, I say go for it. Even if there's not enough of a market in your local area for a full blown 2 hour tribute show, perhaps you could join forces with another rock tribute band/s and do a one set Motorhead tribute as part of a multiple tribute band show? That way, less than hard-core Motorhead fans will be able to get into the "best of" Motorhead without sitting through two hours of obscure album tracks.