The campus pinpointed as ad market

The bumper stickers say, ''If you think education is expensive, try ignorance.''

Despite the all-permeating news that student funds, including loans, are getting more difficult to obtain, there continues to be a strong back-to-college movement.

That's the opinion of Belden Associates, a marketing research firm, expressed in a recent survey done for CASS Student Advertising Inc., which sells ads for college newspapers.

Students spend over $200 a month on snacks, beverages, and entertaiment; make an average of six long-distance calls a month; a third of them buy traveler's checks; and a majority hoard ''cents off'' coupons.