Quote: "I don't think an MMO server should really be built using DBP."
It can be done; but it is something you have to dedicate your life to.
If you were not confident about DBP networking you can use DarkNET with .NET/C++; the server[s] could be created in Visual Studio and DBPRO would only need to carry out instructions, not create instructions; focusing on its strengths, synergizing the process. But it takes at least two people or a top class programmer to feel comfortable writing code in two languages at the same time.
If you are really knowledgeable with DBP then you could put your mind to it and make it work; a net-services does not need to be defined as a single single server; it can be defined as a number of host programs on a number of computers designated to specific jobs; but you need to sacrifice your life to put enough effort into it.
DarkNET features instances and threads; a single program can host more than one 'server' whilst running as more than one 'client'.