A company whose main activity is selling goods or services wants to run competions with cash prizes as a form of advertising and promotion?
And you want to know what the tax implications of this are for A)the company and B) the prize winner.
If this is the case the company needs to understand what the objectives of the promotion are:
What are the costs associated with the promotion?
How do you measure the effectiveness of the promotion?
Is the company in a postion to meet its commitments? A few years ago Hoover ran an open ended promotion involving flights to the US - it effectively broke the company.