I do not think your awards are very appropriate. Because all of a sudden the matter goes to one person
For example, the first time you ran a contest, it was such that if the first person did it, the others would be disappointed and would do nothing !
My suggestion is to consider the first, second and third place for certain prizes so that others can hope to get at least some prizes. For EX:
First Place: Half raport activity.
Secound Place: $200,000.
Third Place: $100,000.