expression
due to popular demand; by popular demand
A set phrase used in commercial or promotional contexts to indicate that something is being offered or extended because it was well received.
好評につき、セール期間を延長いたします。
Due to popular demand, we are extending the sale period.
好評につき、増刷が決定しました。
By popular demand, a reprint has been decided.
A fixed phrase composed of 好評 (favorable reception) + に + つき (conjunctive form of 付く, here meaning 'because of').