Ohhhhh, I totally forgot about Alpha Seed. Awful Soul I don't remember, but the others I do, and yes, like Tempesta, and a lot of other vendors I'm familiar with, their style of products and promos are very recognizable, so I know who the vendors are without having to look at the names.
Of course, a lot of folks haven't been in the 3D universe for a long time, for one reason or another, so someone might mention Aeon Soul and they'll shrug and say "Who?????" simply because they remember them as Aery Soul, or they're brand new to 3D graphics and won't know who Aery Soul or Alpha Seed were, or that they're all basically the same group who just changed their vendor name for whatever reason.
As far as losing sales, I'm sure vendors who change their names go out of their way to make sure folks know who they are, or introduce themselves to the new folks who didn't know them before. If they don't, then losing sales is their problem.
As far as CP not combing both of Tempesta's stores into one, that may be on their To-Do list, but hasn't been done yet.