CLs that take 6 or 7 units

We have been to several CLs recently that have had 7 units on the site. These have not been the odd night for someone in an emergency, but 7 pitches in continual use. Since in each case we have had to pay for 2 nights in advance, it obviously hasn't been a last minute "squeeze in".  We feel cheated when this happens. None of the sites have been big enough for 7 units and have felt very cramped. Has anyone else had this experience? Am I being picky to think that 5 units should mean no more than 5?