A "personal" website enable the provider to add "qualities" to herself that a normal ad would not. For example, a BackPage ad is limited in the amount of texts a provider can add. I think it may be 200 characters or so. Or, a Euro's ad is limited in the amount of pictures it can post. The text and pictures are two qualities that are deficient. In addition, you can only post certain pictures on those two types of ads.
However, a personal website allows the provider to introduce herself, her background, and her story. Some provider's personal websites really captures who they are because the texts are not limited. I enjoy reading their backgrounds because it allows me to know her more and build my expectations.
A personal website can also upload many photos. I enjoy seeing a wide variety of photos, especially in different environments such as a nature or inside a building. Personal websites also have features such as updates, calendars, screening methods, proper etiquette's, blogs, and expectations. These days, some providers upload professional and non professional movies or short video clips about themselves. Some are videos are like watching a movie. Some personal websites need passwords to access them if your more discreet than others.
Personal websites for me at least, shows a degree of professionalism and appreciation for the occupation. It's like me feeling naked without my watch, or me not having a cell phone, or me not having an email address in these modern times. I feel somehow deficient and not presentable, like I'm not "competitive" enough.
When I look at a Ero's ad, I do look for a personal website because I want to know her more. I want to know the qualities of the women I'll be meeting. Sometimes, I want to see her wish list in her personal website so I know what to bring. For example, I know that she loves a specific type of chocolate or a specific type of perfume. Yes, a personal website is a determining factor for me to see a provider but the influential factor are her reviews.
In my occupation, or any kind of work that I do that produces a few dollars, I treat it as a professional business approach. It may need different email address, different ways of contacting me, some sort of website to allow the viewers to be better informed, or something of that nature. Especially in these modern times, a provider needs a personal website to stay competitive