Why is there no SaaS asset management service?

I'm looking to manage application software on about 50 Windows PCs to ensure that we have bought all the licenses we need. Almost every company in the space has a 100 or 500 seat minimum. I've looked at Dell Kace, Express Metrics, Scalable, Snow Software, TrackIt, iQuate, and Front Range. All of these sites include Products, Services, and Partners in the top-level navigation but never Pricing. All I want is a link to an installer I can get every person in the company to run, and then a web-based dashboard where I can see what they have installed. Remote install and uninstall would be great but is not essential. I want to be billed a small amount per user per month (a buck or two?). I'd forgotten how much I hate enterprise software. Hasn't anyone come along to disrupt this space?