I emailed the halleybtc team and they replied with this:

"The Experience Money is NOT allowed for withdrawal and will become invalid in your account after 14 days.
You could earn some short profit from Experience Money rather than re-invest it. Because it does not meet the time requirements of any financial product. Thank you

Best wishes
HalleyBTC Service"

So it's like a promotional thing where they give you an amount that you can make profit off it for 14 days.