A friend of my ask me to join him to start an new online business, and it's a big project can take 1 or 2 months to complete, and I also need to provide the ongoing maintenance, Maybe Hosting is one of another service I need to provide(if site gets minimum traffic, I'm ok, but if it's generating huge traffic, hosting cost can be a lot). and he offered me 5% of the shares instead of paying me any money to do the work.

Since it's an online business, should the web developer get more shares? Disregard it will or won't make any money in the future, 5% shares might be too little? Because another of my friend works in a big company, usually 15% to 25% of the budget goes to the Web Development.

any one has related experience willing to share?

Thanks in advance!