Without expansion, the record-breaking annual statistics will plateau at about 100 cruises and 241,000 passengers a year.
Despite recent problems, including Thursday's stranding of a cruise ship at a dock in St. Maarten after an apparent generator failure, cruise demand keeps expanding.
Royal Caribbean's Enchantment of the Seas ties up at Baltimore's single berth each Saturday morning to disembark 2,200 or so passengers and take on a like number in the afternoon for cruises to Bermuda and the Caribbean. Carnival Pride performs the same bit of nautical choreography the next day.
Given most folks' Monday through Friday schedules, there isn't potential for weekday growth. If Baltimore wants to be a bigger player, it has to move carefully.
"We're at capacity right now doing two cruise ships a week," said James White, executive director of the Maryland Port Administration. "Both cruise lines are very satisfied with the profit levels, otherwise they wouldn't be back. When we look to expand that business, which is something we need to do, we need to keep the companies and the passengers happy."
Royal Caribbean has announced it will be sailing out of Baltimore next year. Carnival's contract with the port ends in August, with a series of one-year options that take it to mid-2016.
To keep the peace, the port would need to do an extensive — and expensive — marketing survey to gauge demand for a third or fourth ship. And, White said, officials would have to see if Carnival or Royal Caribbean had any interest before trying to find another partner.
"We have to be very careful that when we do move forward and provide more cruising for Maryland that we don't take passengers from Royal and Carnival and they're not sailing full anymore. If they're sailing at 60 percent and they're losing money, then they're going to another port, and we've blown up our cruise business," White said.
Getting a cruise business to flourish isn't easy, as neighboring cities have shown.
In 2010, after spending $21 million to turn an industrial building in South Philadelphia into a cruise terminal only to attract a handful of ships each year, the Delaware River Port Authority voted to terminate its lease.
Since opening in 2007, the $36 million Half Moone Cruise and Celebration Center in Norfolk, Va., has never been able to match the record 107,000 passengers who used a makeshift terminal in 2004. In 2010, Royal Caribbean dropped the city as a home port.
"I'd caution Baltimore to move slowly," said Carolyn Spencer Brown, editor of CruiseCritic.com. "Yes, they need to talk about expansion, to do their due diligence. But be careful what you wish for. Look at Norfolk."
The first ships began calling on Baltimore in 2001, after the Sept. 11 attacks closed New York's port. In May 2006, the port opened a $13 million terminal in a converted paper warehouse, so that passengers no longer had to compete with cargo at the Dundalk Marine Terminal.
Ragina Averella, a spokeswoman for AAA and a cruise aficionado, said she switched from Florida ports because of the low prices and convenience.
"You don't have to pay for airfare, and you don't have to worry about airline issues and security hassles and luggage weight," she said. "You literally pull up, drop off your luggage, park and walk onto your floating home for the next week."
Brown called Baltimore a family-friendly port.