The point for them is that there's no possibility of chargebacks (I bet that alone will be a big deal) and relatively modest payment processing fees (presuming they use bitpay or something similar).
When speaking to merchants about this kind of thing before the "no chargebacks" thing is the one thing that really grabs their interest.
I wonder if the administrative overhead is worth the fee with paysius or bitpay... Depends on your size, I presume.