Founders usually carry most (if not all) of the risk associated by starting a new company. Founders are therefor in the end responsible for it all, for making sure enough capital is earned so that everyone can get paid.
Also it's usually the idea of the founder, hopefully a new idea or an improvement over an existing idea.
Greater risk should carry greater reward in my opinion.
And I think you won't find any founder/entrepreneur who will think otherwise.
If you had an awesome idea and become a founder/entrepreneur and you carried all of the risks, wouldn't you want a possible greater reward?
Disclaimer: reward from the founder should hang on the success of the project, if unsuccessful (s)he won't have a good reward either.
I don't think founders should get a large stake upfront. By virtue of being first however, they will participate in most token distribution events, and thus accumulate the largest stake of coins.