No. In my project, the tipping is merely to say, "I really mean it" than to get the target to take that free money.
The point is I could buy a million email addresses and tell them about bitcoin but most would be repelled. Or I could go to each single one of them and write personal messages but that costs immensely much time so within some months I only contacted 15 people. Or I could have a project dedicated to explain "bitcoin for charities" or "bitcoin for business" in the mass mail style as it is pre-made but with a personal dedication as it comes with real money.
I would like to invite the business people to donate the bitcoins we give them or return them as no matter in what way they interact with that site, they will have bitcoin on their mind afterwards.
Actually I assume merchants will in general not take stashes of 1-10 bitcoins but they might be moved a bit knowing that x people tipped them to look into that new thing.
So again: My service is only to promote the use of bitcoin, not to be a way of moving money in the first place. I would even think of using instawallet as an established service with an easy api.