Do I actually need Pro Sites if I'm not using tiers?

I have ProSites installed on my multisite, but I'm not sure I need it. I'm using Stripe for subscriptions. Almost all of my clients are custom quotes based on the size of their organization. As far as I can tell, it's not possible to set a custom price for each site.

So, if ProSites isn't handling billing, do I actually need it at all? What other benefits does it provide?