Because you get a full VPS, maintained by me.
At 10 people, it's already cheaper than other services, which usually charge a few bucks per user.
At 10 people, it's already cheaper than other services, which usually charge a few bucks per user.
This is bad. You're throwing resources away and increasing your management overhead. It would make more sense to have some sort of bouncer-type proxy to determine the source then route through to a dedicated ircd instance on a shared box (e.g. x ircd instances, one per customer).
I love this idea, though. I just feel that your approach of giving a full VPS is a bad idea. People who want a full VPS will buy a full VPS for much cheaper than the 20GBP you're offering it for.
What you need to do is multi-tenant your hosts, and isolate them from each other. Then you'll get costs savings that you can pass on to your customer; which will put you in line competitively with the likes of HipChat and Campfire.
Great idea, can't wait to see what comes of it!