So you believe that if bitcoin had a presale it wouldn't have a.) faced much more hostile attitudes and regulation and b.) failed to gain the critical momentum necessary for mass adoption? 
 
I believe that time will eventually show that pre-sales simply don't work to do anything but temporarily enrich the launchers.  It is a damn fool waste to take what may be valid technology and piss it away on a concept that might endanger the entire implementation at the benefit of padding the creator's pockets a little.  Premines and shadow mines are the same thing. 
 
If Ethereum is crumbling due to it's presale and the attitude of its creators that "we can't do it all, you guys help build it" what do you think will eventually happen to Iota? 
 
Perhaps a solution is not easy to launch a DAG implementation without a presale or premine (and honestly I'm not even 100% sure what this means still despite my best efforts to understand - somehow a lack of blocks and distributed network is supposed to create an infinitely scalable network at the cost that people don't know where money came from until they spent it... or something like that), but that doesn't mean you should take shortcuts. 
 
Worst case scenario?  Don't sell the initial tokens at all.  Allow anyone who is interested to sign up and receive free tokens to seed the initial amount.  Make a topic on the Altcoin ANN section and make an announcement on the cryptographic mailing lists so no one can claim you didn't try to let as many people as possible know.  Let those who received the free tokens then assign their own monetary value to them and let the network's value grow organically afterwards.