I suggest that we refer to merged mining as symbiotic rather than parasitic. 
There aren't too many devs who will make their coins merge mineable with myriad when we're openly advertising that we're going to bleed their coins dry.
Our intention isnt to be parasitic. In return for becoming merge mined. I personally will help keep MM coins up to date with BTC/LTC bases. Help with any issues, hard forks etc. We also dont intend to promote dumping which is why all auto-trading is manual on PolyMYR atm
it would be a cool idea to be able to have a myrchild that can mVpow with PTS or similar to have a reason to hold coins mined (its pretty sweet getting a bunch of those bitsharesX and then selling them to buy more PTS)
just a thought.
.. 
another measure to have a check and balance on the coins willing to have added security with Mvpow or MM would be some kind of very long coin maturation time for alt coins mined.
for example.
coin A is MM or Mvp with Myriad. Developer of coin A wants increased security for said blockchain but not added sell pressure. Dev would more likely be in favor of a 30 day maturation period before coins can be sold. 
--> this gives the dev of coin A the benefit of  
1 added security 
2 less sell pressure and more coins being held for that period of time 
1 + 2 = higher probability of a successful launch and reasonable time frame to allow coin A to gain traction. 
Then when those coins are matured and now in the hands of the Myriadians who mined them.. this can look similar to a share offering. 
Am i making sense so far?
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just an idea meant for brainstorming, criticism, expanding upon, u know the deal.