Yeah, that's what I plan to test first.
On one of netSpend's summary pages or something it implies billpay is $1, but when you try to pay a bill via your account the links I was clicking usually indicated something like "fee varies" and the fees seemed all over the map (but higher than $1). Clicking something else gives the ACH details specific to your account, with the implication that that sort of billpay is free.
Any netSpenders wanna post a short Strategy Primer? There's new netSpenders due to the silly CVS/PayPal promo from right before Thanksgiving.