Clones make sense to me...but only from a space standpoint. For example, if you're putting together a build in a 2 x 84 hp cab, it's probably not the best idea to go with a full-sized version...space is at a premium, and you need to maximize functionality over space requirements. But if the build in question is huge, then you can either choose the bigger (and usually original) versions, or stick with the formula above and have more space for...well, more.
to some extent yes - but let's face it it's better to start with the modules and then find a case based on the modules than the other way round
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities