[luckychancer]

Only having to post 1/2 the $$ and getting 1/2 the profits is a pretty good deal for the staker. So much so it might be worth staying at NL $50 for 100% of the profit and just paying for some lessons one at a time.
If the lessons are that great and only available if you are staked then it's worth entering into a limited time arrangement at the above rate to be adjusted on the consent of the 2 parties after a set period.