Apologies, I'll explain a bit more
Google PageRank is an algorithm which measures the importance of a site and its webpages by taking into account the links that are going to that site and its pages. Most links which do not feature the rel=nofollow attribute and are crawlable by googlebot pass PR. Your site has a PR of 4 due to the (PR passing) links which are pointing at it.
The thing is, a site which is not in use and has little content normally wouldn't have too many links pointing to it. Who would link to a site which isn't currently in use and doesn't have content on it? This is why I had a look at your backlink profile. Using Majestic SEO (apologies I can't post links yet, but a google search should bring it up) I saw that there were 4,670 ext backlinks pointing to your site. The majority of these pass PR (i.e they aren't nofollowed). The majority of these are in the form of low-quality blog comment links.
Normally I see these types of links when someone has purchased links from so-called 'SEO Experts' (or link building spammers as I like to call them) or when a site has been a victim of a negative SEO campaign (this is when someone builds low-quality links to your site in an attempt to get you penalised by Google and push you down the rankings).
The problem with these types of links is that Google will often view them as being an attempt to manipulate rankings. As per Google's quality guidelines:
"Any links intended to manipulate PageRank or a site's ranking in Google search results may be considered part of a link scheme and a violation of Google’s Webmaster Guidelines. This includes any behavior that manipulates links to your site or outgoing links from your site.
The following are examples of link schemes which can negatively impact a site's ranking in search results:
- Buying or selling links that pass PageRank. This includes exchanging money for links, or posts that contain links; exchanging goods or services for links; or sending someone a “free” product in exchange for them writing about it and including a link"
If Google spots such activity (either through an algorithm or manually) they might issue a penalty on the site. In worst cases, these penalties can drop your site's PR to 0 and remove all the pages from the index. In order to revoke the penalty you would need to either get the links removed (or nofollowed) or disavow them and then submit a reconsideration request.
I wouldn't usually view a PR of 4 on a site that isn't used and has little content as a good thing, even if it's ranking above other popular sites. People don't usually link to such sites, which should set the alarm bells ringing.
Hopefully this helps explain a bit more as to why your site currently has a PR of 4 and why a high PR isn't always a good thing.
