This may seem like a stupid question, but why is a standalone reverb box so expensive, given that many amp builders add reverb tanks for not much additional cost? I assume it is the additional preamp tube circuitry? I mean.... a Fender deluxe reverb is like $1K; if I was going to spend $600 on a standalone reverb why not just spend the extra $ for an amp that had a good reverb in it?
The flexibility would be cool, and adding verb to a dry amp you really loved otherwise might be a plus but $600 is a lot of cash...