........and registration is closed.
registration is closed so that people use the other pools....
at least give miners an option to pick pools.
if the network is well balanced i'm sure all miners will be welcome again but it's important to balance the hashrates throughout the network...
the problem is if the difficulty decreases to a too low value and if for some reason a pool finds too many blocks in a very short time span and in the same time let's say a multipool joins the network and also finds the same blocks in the same time span (with his huge hashing power very probable) but is on a completely different location on the planet the network can't sync properly and the chain could fork...
it is very unlikely in this case but you never know...it is the responsibility of the pool admins and the miners to keep the system stable or else their "product" will be worth nothing...because there is none...
always keep in mind that you are not only making money with hashing you are providing a service to other people...