Too many loopholes that I can think of.
The only way that i think something like this would work would be if a script writer creates a script specifically for the purpose of the event and it tracks the xp gain of each user. That way people cant fake everything.
With his logic, I could be making bank.
Timekeeper, that bandos on your account is actually mine, I left it on there when i did a service for you, you know, that one 10 months ago.