Cause with only 42+1 ZEN, actually more them 60k secure node can be run ...
Never reach profit at all, it will cost you more except if ZEN price raise.
Maybe a limit about 100+1 ZEN can be good so in maximum if all coin go to secure node we will have less them 21k secure node (Steel umprofitable but with more hope)
Something like 150-200+1 ZEN would be even better.
http://zen.lebre.net/
10k nodes is 420k Zen Bittrex has under 200k in orders book.
System will be improved over time, when Team collect enough information from system itself. Trough system of proposals and voting we will be able to change and improve almost all elements of this system.
I doubt that the 42+1 ZEN will be changing anytime soon. I don't see the dev team changing it.