Tickets is a simple Pages database that emulates a ticket system.
In a few steps you can have your own ticket system installed and ready to interact with your members, without cost.
Each member will see their own tickets, so you must be logged in to view your content.
DEMO
User: Test
Password: test
After the cPanel price hike and limit to 100 customers only on their best plan (you have to pay $0.20 for each customer after 100), I would choose Plesk. Plesk still seems safe.
VestaCP is good when you are a client, but it doesn't have many features for the seller. I agree that it is nice.
I have also used ISPConfig (as a free panel) and it was nice.