About creating a giveaway with a * after the name

Those games are bundle / exploited and will give contributor value in a different way.

Reduced value.
You'll get 20% of your total contributor value (for all games with the asterisk, the 20% won't stack with each reduced value game), instead of full value. If you never given a game before you get an $25 of contributor value making the maximum $30.

If you want to increase your contributor value you'll have to give away games without the asterisk

Ok thanks for the info.