I have a hard time asking for favors, especially if they seem unreasonable based on factors in my head ("is this a reasonable thing to ask for at all? do I have a relationship with this person where it's okay to ask for favors?") So asking strangers for free iPads is... way over my comfort limit. :)

My relative happiness asking for favors and having favors asked of me does probably strongly influence why I stay in my job, but I think that's the direction of causality there.