What are the benefits if the giveaway is for higher levels?

Users may often create GA's for a higher level due to a less prevalent number of rule-breakers, or to reward those that have contributed to the site as a whole. There is no direct benefit. I'd advise you to also read the guidelines and FAQ yourself, particularly what is expected once you win a game. The FAQ is here and the guidelines are here

No there isn't. The only thing is that less people can enter it (the people who have given the most).

There are no real benefits. It's a way of acknowledging the ones in this community who has given away a lot of games themselves. These people tend to be a bit more active in general and participate in groups. If you make giveaways for higher levels your name might get noticed more quickly by someone who is recruiting for a group. But that's it really.

bottomline: do whatever you want and thanks for sharing!

Thanks all for your answers! I close this