Why not? They signed up to the "Articles of Confederation and perpetual Union between the states of New Hampshire, Massachusetts-bay Rhode Island and Providence Plantations, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina and Georgia."
That "perpetual Union" part seems like the "roach motel" clause you write about, although it seems to me more like the "till death do us part" clause in the marriage union, which is another union you can't just unilaterally walk out on when you feel like it and expect no repercussions.
I will argue under duress they(colonies) formed a "hang to together pact" in the face of war with GB. After the war, the English Crown recognized each individual colony as an independent state. It was in this environment the USC was ratified without the perpetual union non sense.