Off topic, I guess, but have you found a way to do it consistently? Randomly getting it once an hour isn't worth it for me.
Nope since I only started trying with Lana recently and stopped after getting the second time. I think either way there's some luck to it since the deducted rupee needed for the underflow is probably randomized as well. And 10 mill rupee once an hour isn't worth it? Is there some secret I don't know about that gives you the same equivalent in levels or rupees in an hour?