The phrase "permanent customers" is correct and usable in written English.
It refers to customers who continuously patronize a particular business or establishment. Example: "The store has a loyal base of permanent customers who have been shopping there for years."
She hopes these jittery converts will become permanent customers.
London suddenly struck me as some immeasurably vaster, subtler Westfield, an open air Westfield with 8 million permanent customers.
Some merchants have complained that Groupon did not help them win permanent customers, and instead delivered bargain seekers taking advantage of price cuts.
Once training is completed, colleagues move to our permanent customer assistant rate of £7.41, again regardless of age".
Therefore, the funeral homes could leverage their counseling competence to achieve quasi-permanent customer retention because "those who return after 5 years often want to talk to the same advisor, particularly because they had revealed many intimate details" (Expert 1).
NetLibrary sells its customers permanent access to 22,000 copyrighted electronic texts grouped into subject areas.
In its first-ever transparency report, Vodafone said that in a small number of countries, it "will not receive any form of demand for lawful interception access, as the relevant agencies and authorities already have permanent access to customer communications via their own direct link".
Instead of trying to convince its user base to shell out a huge chunk of change every two or three years (something many people wouldn't do), it keeps its loyal customers permanently (or as permanent as any customer can be) — and it has this fixed pool of recurring revenue.
Senator Charles E. Schumer, Democrat of New York, wrote an open letter to Mr. Jobs on Thursday demanding that Apple give customers a "permanent fix" to the problem at no cost.
Indeed, Mr. Perrette suggested that television networks may not be doomed to the sort of permanent war with their customers that has engulfed the record labels.
A SELECT number of clubs have quietly kept a permanent guest list for favorite customers.
