Do the math, if they can stake you for over 5Gs, what do they need your $99 for.
If you want someone to stake you in tournaments, ask the players that you have been beating regularly at your home game if they want a piece of your action in a real tournament.
/credibility alert
My brother said he was talking to David Bach in Athens and says David did that exact thing almost 2 years ago. Go look up his results in the cardplayer.com
database. (Bach's not my brother's)
Said he sold shares in a $100g backing that would pay for a year's travel and entry fees, then structured the payback to give most to the investors for the first $150 (they break even), then progresivly gave more to him.
/end credibility alert
I'd just say the scam artists have just found a new rich vein of suckers (borderline poker players who think they could make it as a pro with just a little bankroll).