Haters will be haters. I've been using credit spreads like this for a while. And like the %^&** above.. I also use charts with indicators to show me "when" to place the trade. Take the profit... and look for the next opportunity.
I've wondered the same thing.. actually calling TOS and quizzing them on their knowledge of PM and Live money. They call say that if there's volume and liquidity.. there shouldn't be "any" (operative word) problem.