I've got four trips planned for the summer between Helsinki and Geneva. So 4000 points each trip and with the current summer price campaign (Kesähinnat 2013), it's 5000 points to upgrade (10000 normally for this leg) to business class one-way.
By buying 4000 points + 1200 bonus points for 100€ I'll be able to upgrade one direction on each trip to business, Yay!
I had 4000 points from a previous flight so I can actually get all the four trips (or half of the flights) upgraded instead of waiting for the first trip's points registering.