From a pure investment perspective (where I as the investor want the best yield for myself no matter what else happens around me), the DAO SPS is not liquid (unless we vote to spend it on something like buying DEC for the LPs etc).
So, this proposal removes liquid SPS from the market. It puts it into the hands of an entity that won't sell it.
If the market cap of SPS is $100 million dollars and there are 100 million SPS, then your SPS is worth $1.
The price of SPS is determined based on the demand for the liquid tradeable SPS.
If the DAO (through initiatives like this one) gets 50 million SPS in the scenario above and the demand for SPS remains constant, the price of SPS will go up roughly 100% because people still need it to do other things, but there is 100% less of it around to trade.
And the best part for that scenario is that those of us with the 50,000,000 SPS are all partial owners of the DAO SPS too. It's ours to decide what to do with in the future.
Of that 6% SPS from the staking rewards that the DAO will be accumulating if this proposal passes, most of it will go to the largest stakeholders currently and hopefully they have the game's long term interests at heart, but a decent percentage of it will go to people who don't have SPS long term interests at heart and are just chasing yield to sell SPS for whatever the next shiny thing is.
We know the DAO will always prioritize what it thinks is best for SPS.
RE: SPS Proposal - SPS.DAO should stake an additional 28,000,000 SPS for a total of 30,000,000 SPS