Why ask for free items ?!?!

Why do people ask to get stuff for free? I'm generally shocked how people can build up the nerve to ask. A person asked if he/she purchased and item ($20) can they get the other one ($8) for free. Like If they would have Bundled and offered $24 or some I would have said yes. But asking for free ? Like no I'm not giving none for free. The one case I'll give free items if someone bundles a bunch of items I'll throw in some lil gifts as a Thanks.