The seventies weren’t the best time for comics overall. The number of venues carrying the books was dropping, the printing was often, at best, lousy, and the page counts were dropping (at the low point, a new comic only contained 17 pages of story). At certain points, cost-cutting measures were employed, such as having the artists draw a page sideways on the board, and then printing it as a double-page spread (with oversized lettering compared to the rest of the book and thick inking that was intended for greater reduction, looking as though it had been done with a stick.)
Even in the best of times, THOR can be a difficult sell. And 1975 wasn’t really the best of times. Attempting to cash in on the barbarian fad in comics started by CONAN, THOR often vascilated between trying to look like a sword-and-sorcery comic and a super hero comic–largely to the indifference of both readerships.