Reading the title of your thread, I thought you meant that alt accounts should earn less exp per quest completed. I think it should be the same, or if it needs to be changed, slightly more exp per repeated quest would be preferable. So I voted yes in the poll. But like Enodoc said, if you don't want to keep repeating the same quests, you can earn exp elsewhere.

I like the system Diablo 3 has, where new characters still start at level 1, but you earn bonus points to use based on how high you leveled your previous characters past the soft level cap (70 since I last played). For people who don't know, you start earning "paragon levels" after 70, which are shared by all your characters. New characters gain the benefits of paragon levels, but do not contribute exp to the next paragon level until that character hits level 70 themselves. So it's much easier to speed through early-mid game quests that you may have already completed a dozen times or more.

[Do you wish to skip the tutorial? YES NO]
[Do you wish to skip already completed "non-main quest" quests from your faction? YES NO]

I say they let us buy levels from the crown store for alts.