Now that there is a serious reward tips are pouring in and investigators have a lot to track down and chew on. But as I said before, having to increase the reward amount four times makes this look amateurish and unserious. Why didn't they start with the million dollar reward? No one who might have seen something is going to be motivated to lift a finger for $1500 or even a $10k reward. Now that the money is serious, everyone who might know something is paying attention and sharing what they know.
Do you notice or buy lottery tickets when the prize is $2 million or even $20 million... or do you only pay attention when it's $200 million or larger? Same idea.