==>  There is a fundamental difference between stock and coins.  Stock are IOU of the company you owned.  coins are not an IOU.  

The fundamental problems with the DASH instamine are twofold.  I fully agree that your idea of a locked-in PREMINE to pay the devs, which is publicly known and announced, is a good idea.  It should be in the genesis block.

I'm not calling the instamine a scam.   But it is an *issue*.  It is not a scam because we know it now.  However, in any credible monetary system, nobody is supposed to own more than at most a few percent of the total stash.  When the ownership of stash goes to the 10-20%, that monetary system is entirely in the hands of this stash owner, and hence open to all kinds of cornering, market manipulation etc...  The instamine made that the devs (and their dog) owned essentially >95% of the stash at a certain point.

On top of that, DASH has a partial PoS scheme, allowing the initial RATIO of stash ownership to be partially preserved.  For instance, in a FULL PoS system, if you initially own 20% of the stash, you will (unless you spend them) always own 20% of the stash, even if the amount of emitted coins goes 100-fold.  Given that PoS of DASH is only partial (45% + 10% of the gouvernance tax) this will lead to the initial >95% stash ownership to diminish to about 50% or as of today.

And on top of that, DASH has an anonymity scheme that depends on having very many non-colluding masternode owners, which are also a PoS scheme.  If a single entity possesses 20% or 50% of all "non-colluding" mixers then that is a fundamental security issue.

This is why the sneaky instamine IS an issue, at least on paper.  In reality, as most of crypto is just a greater-fool game, not to be used much in reality, nobody really cares, and it was actually a good idea: at least, someone's going to get rich on the back of a lot of greater fools.