356,775 registered so far. The next round is
Dec 15, 2019.

You'll get
280
Lumens (XLM) each month if no one else registers.    

As at the time of my writing, this is the current number of entries and potential reward per account. Are you selling the XLM because you know it could potentially be worth less than $20 as at the time of distribution? There's still about 6 dyas left so its likely going to decrease even further.