Investors are equally concerned with the fact that they might lose...and the financial downpour it would cost. And when you are paying out the bum for lawyers all the time, a "no decision" is the same thing as losing.
Remember the first rule of gambling...you only bet what you can afford to lose.
Not to mention the bet this time is very much in E*'s favor, not just because in a summary contempt setting, E* only needs show of evidence to demonstrate the doubt, and TiVo needs to prove by clear and convincing evidence.
But if one simply reads the appeals court reasoning when they overturned the hardware claims, it was not easy at all to prove infringement, a little slip here and there would almost have had the whole verdict thrown out.
And BTW that was against the old design that was by all evidence carelessly received from the prototype DVR TiVo had given to E*' engineers back then, and E* did not think through when they just used the TiVo technology.
After the infringement verdict, E* looked at the exact elements they were found to infringe, and made the point to take out the "core" of the invention, this time with all the care and scrutinies applied, because they most certainly did not want to lose another $100M and more.
Taking into consideration all of the above factors, one can make an educated bet. Not that the bet has no risk, all bets have risk, otherwise we do not call them bets.