I see little point in spending money to prove the resistance of a network against an attack that not yet affected that network even on a small scale.
My issue is with people who spout off attack vectors with a low probability of success or are otherwise properly dis-incentivized and waste everyone's time.
In my opinion this sort of test could also be a big "marketing" aspect, if the masternode network (the masternode owners) would accept and fund this sort of test, and if the masternode network would resist the ddos attacks of a medium botnet.