It's not that making an MMORPG is especially difficult in DBPro or anything, in fact it's probably less dificult then other languages, but it's that making an MMORPG in any language is an enormous task, especially by yourself.
You got the correct answer from the staff as far as DBPros capabilities, yes DBPro can make one. But can you?
That's why people are telling you it's "impossible", do a search on this forum for MMORPG's and you'll get an endless list of people before you who have attempted it.
Just like any other language it depends mostly on the skill of the programmer.
The right man in the wrong place can make all the difference in the world. -- GMan