for who want to have links for more of 1 months :
fact : the pr can increase of much.
you must do offert with option if the pagerank increase or decrease.
I’d like to have a option to cancell your links with a payment.
this is a example ex. 3 link for 4 months
price : 60*4 = 240 $
if website became Pr 4 : in next month there is a increase of 12 $ to link from pr 3
if website became Pr 5 : in next month there is a increase of 25 $ to link from pr 3
to option you cancell the link pr 3 or pr4
after 1 month is 5 $ to links ( something pr ) ( then you pay 60 $ for the first month and I pay to you 5 $*3 month * 3 links = 45 $ )
after 2 month is 6 $ to links ( something pr ) ( then you pay 120 $ for the first month and I pay to you 6 $*2 month * 3 links = 36 $ )
after 3 month is 6 $ to links ( something pr ) ( then you pay 180 $ for the first month and I pay to you 6 $*3 month * 2 links = 36 $ )
after 4 month you pay 240 $ and point.