Hi. But same for Dash - what does taking over a masternode get you? You can't get any DRK, and to deanonimize transactions you need 95.00% of all masternodes just for a ~1.65% chance
Then to obtain 1,950 maternodes today will cost >$9m buying over 40 days if you were 100% of the volume so not that easy (or if you are attacking they are spread over 30 countries with different companies / security systems / home users to get through first).
About BTC - one incentive for taking over BTC full nodes is surveillance, like the current 5% of nodes that are performing a sybil attack on behalf of
http://www.reddit.com/r/Bitcoin/comments/2yvy6b/a_regulatory_compliance_service_is_sybil/It seems pretty resiliant to me. And masternode operators take security a lot more seriously than most, believe
From this article
https://www.linkedin.com/pulse/20140726142214-262891-pricing-0-day-exploits-in-the-face-of-0-day-defenses'Typical pricing for a relevant 0-day is $40,000 - $250,000 according to Frei'
Even if you need a few different 0-day exploits for Windows and Linux and maybe a Mac one you are still going to end up spending a lot less. MasterNode operators can't make themselves impervious to a 0-day exploit, as it is unknown by definition.
I saw a post on this thread by fluffy pony that explained the minimum that MasterNode operators would need to do to maintain security, and I agree with him. I think that it is difficult to keep the MasterNode network secure and if it is attacked then it isn't going to be able to withstand it.