Hmm. I would interpret that as "someone believes A, but customers do
not share that belief". "Customers don't think so either" I would
interpret as "someone does not believe A, and customers likewise
don't believe A."
I might write or utter "Customers don't think so either", but not
"customers don't think so too" -- it seems a bit odd to me.
--
"The difference between the /almost right/ word and the /right/ word
is ... the difference between the lightning-bug and the lightning."
--Mark Twain
Stan Brown, Tompkins County, NY, USA
http://OakRoadSystems.com