quite far

They will get their own people ie, business associates, relatives, friends, suppliers, contractors etc to book the units. You just need to pay a minimal booking fee to secure a unit and create a false demand on the properties. When prospective buyers ask if there are any available units, the sales agent will tell you that its fully booked but there are some of their 'customers' who are willing to let go of their units at a different 'price'. Been there, done that.