The team is going to continue to incentivize SPS staking by giving out more rewards for those who stake. So they are basically saying that those who stake SPS are going to see much higher returns than those who don't.

The DEC pool for the daily rewards was designed around DEC being equivalent to $1:1000DEC. Since DEC is more closer to $1:100DEC, that means the reward pool is currently 10x the amount it would normally be. The reason for this is that it is a mechanism in hopes to inflate the DEC supply by giving out more, however, that doesn't seem to be the case as the DEC price has been pretty steady around $1:100DEC.

SPS rewards isn't affected by DEC price or anything. They just haven't had the time to get to it yet and release this feature, but it should be coming shortly after Chaos Legion is launched.

No plans for blocking multi-accounts. My two cents on this topic is that it is almost to do so anyways, so not even worth the effort of trying to do so.