Hi,
unfortunately the PR is no crucial factor or success. There is only one important factor for a successful website: Visitors. – and how you monetize them. The only advantage of a PR is when you want to sell your website, for many domain buyers this is important.
There are tons of PR5 websites available with less than 5 visitors a day…. but are they successful? This PR5 websites probably dont break even….
@madog 249757 wrote:
Take a look at it: drnightsadultravel.webs.comIf you want to check the
PR
for yourself go here: prchecker.info and insert my website.
Away from PR, check this: Drnightsadultravel.webs.com Site Info
In my experience an Alexa Ranking of ~ 7.000.000 indicates maximum 10 visitors a week. I guess five of them is the website administrator himself. No recorded traffic for this website by Alexa. 0 website reputation. 1 listed search query. 2 Backlinks from meta spider websites. I think you cant call this “successful”.
Regarding the own domain. In fact, everybody can create a website at websitebuilders for free. Experienced web designers build such a website in 15 minutes. Maybe in 10 Minutes. This is why you also wont get many backlinks offers. If somebody wants a backlink from webs.com he builds such a website himself, without the need for a further outgoing link from his “real” website.
Furthermore, with such a website there is no identification with own product you offer. Can you image that google will change from [URL]http:///www.google.com[/URL] to [URL]http:///google.bing..com[/URL] :p
And a further important point is, that you have no control about your website. Imagine you work on this website for three or five years and get 500 visitors a day with good monthly earnings. And then webs.com decide to disallow gambling on their website and close your account… 
This is not meant angrily. I would have been pleased, if somebody had helped me to start internet business ~12 years ago.
I hope you will get a domain sooner