Why can non-timeshare owners get into an RCI timeshare b4 a timeshare owner?

paid $17,000 and $23,500 for two RCI resorts.  You are restricted in so much as you have to bank time with RCI.  The one resort I was not pleased with so I banked with RCI yearly.  
There have been several times as a timeshare owner I could not get into an RCI resort but non-members could.
This time, Expedia, Orbitz, diviresorts.com and Divi Pheonix of Aruba itself had many, many rooms for April 6 - 10.  But RCI had nothing for me during that period.
For all the above companies I would have to pay more cash on top of my yearly dues ($3,425) to stay during those 4 days.
You see if I left on April 6th, I would have to pay American Airlines $1,000 more.
So, what I ended up having to do was put up in a bed and breakfast on the other side of the airport and spent an additional $600.  
Today I find out I am spending my last 4 days in the seedy side of town; oh joy!
I am going to find a way around using RCI as a banking company.
I am so heated, I will complain on any internet site I can find.  They have screwed with the wrong person!