I think cheaper is better
Remember most Web2 games thrive on Microtransactions...
That's only $.10... That's only $.75...
This is what appeals to the masses... this is what most people can afford...
I like this idea for sure!
Edit: You might also consider throwing in a "Jackpot" chance for Epics and Legendaries...
If you have a 2% Chance in a normal pack to be a Legendary... and that pack is 4,000 DEC...
Having a .2% Chance in a 1,000 DEC pack isn't going to hurt the values of Legendary Cards... but... the power of that "Lottery Draw" is HUGE.
There is a chance that players will opt for other Packs because of this "Jackpot" chance. $4 is too large of a price (especially for those who are coming from the high GDP per capita countries). I'm not against having a tiny chance of getting a Legendary or Epic with 1,000 DEC Packs. I don't think we will miss out on a lot by not including these either.
Some Jackpot chance is nice, but I think it's better to have that as a standalone for the other packs, as money has to be made as well.
Have them at the Jackpot-percantages of the reward chests could be okay, so it's one in 100.000 packs or something like that. Also, if you put in legendary, what about epics? The whole idea of these packs was to have them rare and common only, and I think it would be good to stick with that.
Though the micro-transaction-argument is interesting, it's also one of the things that have been critized most about games, since they're manipulative and stand for company greed. But that's a different discussion :-D
I'd suggest running a poll or getting with Jimmy and coming up with one together. We need to see that there's strong stake supporting a change like that from the DAO to run a proposal for it.