Why might an establishment limit promotions like unlimited or extremely cheap drink specials?

Establishments may limit promotions such as 'all you can drink' or extremely cheap, high-volume specials because they can encourage rapid over-consumption, leading to intoxication, harm, and increased liability — and some such promotions are restricted or banned by state law. Responsible managers weigh the risks of aggressive drink promotions and often adopt policies that avoid encouraging dangerous drinking. Understanding that promotions can conflict with responsible-service goals (and sometimes the law) helps managers design marketing that does not undermine safety or compliance.