Depends upon the following factors
- Game Server Requirements
- How many users are present on a single VM node (Try not going for OpenVZ VPS's as they are easily oversold, KVM / XEN are good platforms)
- What kind of Node you are on. Many new providers are currently using E3-1230v1 (...
There is no such thing as unlimited. They will clearly state the actual limits allowed in the Terms of Service. Coming back to your query, Yes many hosting companies have started to use SSD's as the prices have dropped quite significantly also higher capacity drivers are now coming to the market.
You need start off with providing quality services. Everything from your VPS reliability to your Customer Support counts. For example we try to get clients by the word of mouth. Most of our clients are referred by our current clientele. This brings in a sort of Trust to the user and thus helps...