The footnote on the Ameritrade/SPG offer webpage says that one must maintain "minimum funding" in one's Ameritrade account for 9 months or else Ameritrade may charge for the SPG points. My question is what is "minimum funding"?

Does this mean the full $25,000 for 9 months? What if you invest the $25,000 and lose 1/2 of it in the market?

Or, does this mean that you must initially invest $25,000 and then you must only maintain a smaller amount of money (Ameritrade's "minimum") for the next 9 months? I may submit this question and my prior question about SPG numbers to SPG via e-mail. But, I thought I'd ask the wisdom of this group first. Thanks.