you really don't need to record all of the entires if you're just using a randomizer
the more entires people have, the higher chance they'll have at winning, regardless of whether you record the entries or not
But I think to count all the entries in the randomizer
For example, if someone posted 40 times, they would have to put their name in forty times, not to mention counting all the posts per person so that they dont cheat.
Guessing from how popular this thread got, the person needs to put in peoples name over 100 times