My grandmother had some interesting encounters with Roma when she was younger. Apparently, the only time people locked their doors in town was when the Roma caravans rolled through (otherwise, you'd risk them entering your house uninvited, etc, etc, which did happen to her at least once). However, they were apparently also quite good at certain kinds of labor, such a replating (industrial?) mixing bowls with tin, a job she hired a "gypsy king" for, who assembled some of the younger Roma in his group for the task.

I.e., mobility is not mutually exclusive with having so-called marketable skills or providing services.