Sure, these mostly non-competitive leagues are different in this respect. In some small countries even some competitive teams may find themselves in such a situation. Without looking into it to back up my claim, I think Japan may fall into this category.
Japans JBBL has for the first time started to look really lopsided. The Big 8 is a shadow of the Great 8 so finishing 6th or 7th in the great 8 has to be more attractive than 5th or 4th (2nd v 3rd will be a good battle).
Bottom line is you if you can tank to finish 6th and can win your p/o thats better than picking up 1/3 of 1 game road defeat. Maybe the long-term calculation gives the edge to the 4th place team but honestly who thinks like this and this is also assuming you have your ticket prices nailed on price wise.
Take the cash and enjoy. Finish 6th and if you relegate well you weren't as good as you thought you were. Even if you are unlucky you should cruise through over a 3 game series.