Maybe you could provide a few arguments, or better yet : benchmark things :) I have no idea how far this XMPP server can go, how slow it is, but I know that at least 3 orders of magnitude more people on earth can hack on it, debug, provide patches and won't charge insane amounts of money for this :)
ejabberd is free and open software, licensed under the GPL and freely available without charge. I'm not sure where you get "charg[ing] insane amounts of money" from.
