It's one of the key things that WHMCS has and that we really would like to have in Blesta, as it's how we intend to pay our staff and monitor if our staff are working at all. Its a really easy way to monitor / pay people, rather than paying per hour or something.
I understand a minority will require this, but, I do think more hosting companies are likely to use Blesta if its added - as its how a lot of them pay their staff.