I reached platinum status for the first time yesterday. Last night before I saw this thread I compiled a spreadsheet of the total cost of achieving WP from my anniversary date of 1 September 2011. Total cost for 1475 points was $6248 plus 144000 points. Total number of flights was 37, comprising 2 upgrade flights in USA, 12 JASA flights in Australia (3 return trips), and 23 discount economy flights. Discount economy included 2 return international flights, 2 domestic USA and the remainder within Australia, mostly SYD-BNE.
Points earned from flights in the period were 82645, giving a net cost of $6248 plus 61355 points.
My best value for fully paid flights was first class Boston - Miami - New Orleans, 210 SCs for AUD738, $3.52 per SC.
Within Australia, JASA Sydney - Hobart via Canberra earned 260 SCs for $1.36 plus 246 points per SC. Sydney - Townsville was similar, 200 SCs for $1.36 plus 240 points per SC.
Thanks to all at AFF for helping to reach WP status. Two years ago I did not know what a JASA or KUPP was. Now I am looking at how to retain WP next year. All of my travel is self-funded. I am not sure whether to thank or curse all at AFF.