Why are people even doing this? 1k satoshi is way under the dust threshold and will cost you more to spend than it's worth. An input is ~180 bytes, and even if you pay a 10 satoshi/byte fee, you need 1800 satoshis to spend it. While OP is losing money on this, you are losing money too, except to the miners instead of to other people.
OP may be expecting repeat visitors. People who're getting interested with the service what? the site offers will be permanent users of it. If the service you offer is worth enough, this is a good way to find users for the program.