Any plans to integrate with existing procurement systems, manage approved vendors, handle approval levels/purchase limits, asset tracking/management, invoice management, etc.?
You guys are on the right track, but eventually you're going to hit a wall where you'll need some serious maturity with procure-to-pay.
I'm not sure how the tone of this comes across, or if it's in any way negative because you guys are onto something... but have a lot of competition that is often deeply integrated (see Service-Now catalogs for example).