I will use the bitcoin to buy some Etheruem and then buy into Slock DAO. After I have made some profits, I will give 10 bitcoin back.
I think if someone ask you that i give you 10 btc or something, so it doesn't mean that he will give you that amount, he is just telling you that he have some amount of bitcoins and ask you some advice what the best way where he invest it.
Everyone knows that nobody is going to give you 10 btc for free, and that's what everyone is suggesting him that what to do with 10 btc, different people have different ways to spend it.