Take the large number of female avatars currently in Piratez, let's say to be fair we want as many male avatars. Then take the huge number of armors in Piratez, and multiply the two. That's the number of new inventory pictures you have to make.
Then, of course, you'd expect the battlescape representation of male piratez to be different. So you need to remake every playable armor sprites in order to show that. (each sprite sheet is made up of many tiny images, each of which would probably have to be tweaked)
There's also the corpse images, which need to be redone for men.
So you end up with a number of graphics needing to be redone that one could indeed qualify as huge
Of course, once you've setup properly you can save some time (many armors are variants of each others, making it easier to change graphics once you have done the base one, etc), but it's still a punishing amount of work, all "just" to add men to the game when, let's be honest, especially with the many skimpy outfits, female pixel piratez are better to look at.