There should definitely be an activity requirement in addition to the merit requirement being increased.
That would certainly make it harder, but given the number of ongoing account sales, still not difficult enough (i.e. impossible).
I really think they need to of earn't 250 merit, but thats just my thought on it
Again, that would help for now, but just push the problem further down the line as more and more members (and more and more sold/hacked accounts) will eventually reach that milestone.
I suppose the protective feature here is that theymos said he will be manually rebuilding DT1 every month or so, so it would never actually happen without him realizing it first. That does essentially centralize the DT list to theymos and give him a veto over anyone's inclusion though (but I guess that's always been the case to an extent).