Your pricing, however, seems really high. As an individual I'd graciously pay my dues just to support this, because I think it's an idea worth supporting with the right audience in sight (as opposed to PushBullet et al which are more for non-technical consumers), but I feel like it would be hard for sysadmins inside big corps to convince their bosses to bite the bullet on $60 per 4000 notifications when the corp may be sending out 40-50k notifications a day all to different personnel.
Is this intentional? Do you want to restrict the use of this tool to a few hobbyists to avoid having to put too much effort into scaling up to handle those loads? I just put my startup hat on and I'm curious as to how you determined the pricing.