The thing is.. look at the stats, most startups fail. Having an equility split really make both co-founders committed and started in the right direction, which goes a long way about making the startup succeed. How would you feel about starting a startup where you don't have equal split with the person who'll spend all your days with?
If you ask that question, I think it's because you haven't found the right co-founder. I.e. Let's say you have a selling book website for a year with some revenue, and then you can have Stephen King joins you as co-founder. Would you hesitate to give him 50 if he fits the role? Now, obviously you don't have a book business and this is not Stephen King.. but still, the idea applies. If you think it's not worth 50, it probably isn't and you should try to find someone else. Otherwise both party will be unhappy. Your co-founder won't feel equal and you'll find that you gave too much.
That's my 2c (and to explain a bit the lesson from OP)
http://www.bothsidesofthetable.com/2011/05/09/the-co-founder...
You:
if you're considering a cofounder who you don't want to give equal stock to, do you really have the right cofounder?
Mark:
I meet far more second or third time entrepreneurs who wouldn’t do a 50/50 (or 33/33/33) partnership ever again than you would image.
I am one of them.
Based on my experience, I'd recommend finding a co-founder you want to split equity evenly with before you start up as you recommend.
I think the hard case is when you start off with equal and then down the track one founder has a different level of enthusiasm and expectation on level of time involved. If down the track you are working long ours and just about every day and your cofounder is treating it as a 9-5 there is bound to be friction.
For 9-5 vs. long hours -- you need to have this conversation up-front. If there's any doubt that you aren't on the same page or just agree with differences (and compensate fairly), then this is not a good match.
I'm probably just confused. Would you mind elaborating?