However, these are enterprise-class storage systems that are in the order of tens of thousands to hundreds of thousands...
of dollars and usually are part of a larger SAN. There are some lower end storage systems with some dynamic functionality such as EMC's AX150 and HP's All-In-One storage systems, but even these are in the upper thousands range.
So, basically your idea of growing your simple RAID group by dynamically adding drives is unlikely unless you've managed to find a RAID controller with exceptional functionality, which is entirely possible. Given today's state of the art, I've taken a lesson from Sean Connery and learned never to say never.*
*For the uninformed, Sean once said that he would never play James Bond again, only to do so many years later in a Bond movie aptly named Never Say Never Again.
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