Does each account come with a dedicated IP address

Thanks

No this is prohibited by Arin. Ip space is much smaller than number of domains in the world and almost for 2 years now web hosting is no longer is a justification for ip space usage.
Many sites can share the same ip due to virtual host feature in apache.

In case we give dedicate ip each customer we won't get any more ip space from Arin.

We give dedicated ips where it meats Arin justification requirements - ssl, nameservers, etc.