>>527622636
If you don't have anything to spend your Grand Company Seals on, you could spend them on Duck Bones which sell for a pretty penny to vendors. Coincidentally as you mention the Doman Enclave, you could turn them in there as well. Another way is getting into submarines, it's a long process to set up and it will take a bit before you get your money back, but after that it's free real-estate.