Yes, everyone contest has some rules and guidelines. While each one may be unique in their own way and with their rules, there are some basic ones which must be followed.

1.) The contest holder may not take part in their own contest. It's just unfair for the others because you win your own prize.

2.) A prize MUST be granted to the winner. Failure to give the winner their promised prize will result in punishment (either temporary removal, or permanent ban depending on how badly the winner was cheated). The others are not here for your amusement, so don't treat me like lab mice.

3.) One winner must declared, unless the contest requires multiple winners (for example, it's a never-ending sort of contest). You cannot declare there are no winners. Again, we're not here to dance for your amusement.