Oh dear, this policy is not different than any other Disney resort. I truly do understand you are not happy with it, however by now we all know that a WDW stay involves daily access to all rooms.
DVC or resort, the staff will enter.
It is weird how the sales techniques vary. My DD and I are interested in a purchase for the family. SHe and her DH toured when they were at the Poly and were treated so graciously. The guide gave them a tour of both a studio and the bungalow. They gathered a lot of info and are very interested in a purchase. Just not at the Poly. (We cannto fit and we travel together often)
I am not a time share person, so I have signed up for one tour in my entire life. Keep your free weekend, pretty gifts or tix to the nearby theme park. After that experience I was never going again. Anyway, because this is a purchase I actually want I went when I was on a solo trip. There was no need to have my husband there, and I made it clear up front I never buy anything the day I am offered. My experience was not as positive as my DD's, and I left pretty annoyed. I admit I stopped listening after about 15 minutes. When he tried to tell me that financing was a better deal than waiting until I would pay cash he lost me.
I would encourage your sister to join you if she has an interest. The salesman will not insist on couples. I am really glad because my DH will never sit through one but will listen to the information whenMarisa and I discuss it later with him.
I cannot understand the insistence that some of these folks have for teh couple to be present. A few years ago my DS and DDIL signed up for some food service thing. THe salesman wanted leads and he gave him mine. The guy called me and wanted to set up a meeting, but when I told him my DH would not be there he was irritated. He also told me that teh "deal" was only good if I signed immediately after his presentation, and again insisted both of us had to be there. I declined the opportunity. He later sked my DS for leads and DS told him to fly a kite. He also told him he missed out on a potential sale because my DH and I discuss and make decisions after presentations, and never under pressure. This "couple" thing is silly, IMO.