A few major factors for this with the very wealthy. 1) If you have $1B an attorney will tell you that you can win the case. You are surrounded by yes men and women in many cases. 2) The court systems are not well setup for these cases. They let them spiral way over page length / deadlines etc. Compare to someone facing 5 years of prison - often adjudicated in relatively short order 3) For all sorts of gimmick reasons…
Perhaps the limits should be placed on what can constitute a civil law case in the first place.