This was true at some point, but is less so now. As has been mentioned, almost nobody ever uses the number of sub-domains we offer now.
The real reasons:
Each sub-domain still entails an entry in our web server configuration files, with each in turn increasing the length of time it takes to generate them. The more 'sites' we host, too, also increases the complexity of our systems and sheer potential for problems to develop on any given sub-domain. This means added support loads. Again, for the most part, this isn't a huge issue as most people never use that many sub-domains.
The other big reason: from a UI standpoint, the web panel isn't very well suited to extremely large numbers of domains or sub-domains. Anyone who has tons and tons of them can probably attest to this first-hand.
I wouldn't be terribly surprised to see us offer unlimited sub-domains at some point in the future, though it's one of those bullet points on marketing text that illicits "oohs!" and "ahhs!" but is rarely if ever used.
- Jeff @ DreamHost
- DH Discussion Forum Admin