Do I understand you correctly, even you believe that RI @ FINAL is more likely to succeed than fail? Can you give me your confidence level, in percentage, of stop / continue at interim, and success / fail at final? Of course no one knows for sure, but it's not just a stupid guessing game, you must have some numbers in your head.
For example, I think interim - stop for efficacy 65%, stop for futility 1%, continue 34%.
At final - success 97%, failure 3%.
What are your numbers?
If RI succeeds at final, you pretty much guarantee to 5x the current price, right? So even if there is the slightest remote chance of early stop for efficacy, how do you not take this chance now, knowing that you are at least fifty fifty to 5x your money in 2 years?