Not sure if it really works or it was a good idea as that site is now PR0 and not sure if it is getting enough traffic even the domain is 11 years old and been running for a few years.
It is very good that you got pr 5 for your websites but you must continue get link from high relevant pr sites and not think for sell or purchase otherwise Google will ban it.
If I have at least 1 PR5 website, I will make another website and point it to. To groom it until it reachs at least PR3
Page Rank is just a number , If you get a good PR6 link then there is a good chance you will get PR4 or PR5 in Next google update . What is more important in front of me , how my site rank in SEARP's . I have one PR1 Fashion blog which is 5 years old and it has a good traffic and rank in SEARP's as compared to my 1 year old blog with PR5 . So, try linking your site with the keyword you want to rank , PR is just a number and nothing more than that !
can you please explain the idea of making the website?was it with the intention to make money? If yes then how?be specific in your query.I feel the query is on a general note.You must have spent quite a bit to get a pr 5.
High PR is just advantageous if you are looking to sell the site really. Plus people may be willing to pay more to advertise on your site but like others have said Google do no allow you to sell links on your site that are DO FOLLOW and the consequence of which is bad ranking and in extreme situations a banning.
Why would this be advantageous, if it isn't advantageous for SEO, being found with certain keywords or the like?
well you have a PR5 site, congratulations, go on and may the force be with you. that's just it. its just a number.
if you want to increase your page rank of your website, you have to do the link exchange again and not think for selling link otherwise google will ban it. So avoid link sell or purchase. With best wishes.
If you are thinking for earning the money by selling the page rank, It is wrong if google crawler will know, it will banned so you have to increase the page rank continue by link exchange especially 2 way and 3 way which will increase your website populaity. Best of luck.
Make your pr5 website link exchange with other pr5 or more pr website, and I believe your website will increase in the next time the google update.