[b]-One player allocates 2 worker cubes for one sale. To do a second sale, that same player could allocate 4 worker cubes. There doesn't seem to be relocation room for one player to do 2 sales in the same selling phase.
Relocation room isn't the issue, there are only 2 spaces in the row in the first place. How could you put more than 2 cubes there? It would be like trying to put 3 cubes in student testing.