For me personally I'd rather just pick up some really nice normals. I know what I want to see and I don't want just any old normal to be involved in my breeding(as much as I love maru, unless I found a project that suited him, he wouldn't be a breeder for me!)
If I wanted to have tons of breeders maybe, but normals to me would need to be just as crucial to my plans as my morphs. Both parents pass on genes to the babies, so even if one doesn't have a morph, the rest of it's genes better add to the morphs you're making! At least to me. Paying so much for a mystery bag scares me lol, I'm too picky~!
The bags are really nice if you are willing to take a gamble and know what you're going to get. Don't expect a lavender albino pied or anything to pop up lol! Some of the ghana babies are very orange which I like, but I'd rather have some cbb babies personally! I don't want to deal with the stress.