You have to ask yourself a question.
If you are a bigtime trader.
Should I put $250k of my money in some (likely uninsured) account so I can trade $3-5 million at a firm that will get worried about overnight positions, will ask for more money when your account gets low, so you can get a 99% payout and 1/2 penny commissions
or
Can I keep all my money whereever I want it (Schwab, the bank, real estate, pay off mortgage) and have $5 million or more of capital from a well capitalized firm that rewards good results with more capital at a place without the best deal on commissions or profitsharing.
For me, I had enough of all the deals that look good on paper, I prefer to sleep well at night, and if Im on my game, the profits are unlimited.
The same logic applies to putting 20k up at leveraged firm, or trading $500k at a firm capital deal.
I would only recommend a leverage deal for those who are small steady traders with very volatililty.