I use the bitcoin as a currency. I earn the bitcoin by mining. Then I use the bitcoin to buy the online goods.
That is a very good cycle for the bitcoin. It helps the circullatioin of the bitcoin and the final adoption.
When many of us use the bitcoin, more people will know about the bitcoin then the price will rise again.
If they start buying themselves some coins, then yes, it will help the price go up. But if they are just here for the rewards and give-aways like a lot people are nowadays, then what effect will it have on the price? I say next to nothing.
I think it will same no much different they buy for themselves/giveaways and with giveaway ways can make someone interested to use bitcoin because she/he has learn, what is bitcoin.