I personally know of very few "potential co-founders" that don't have a day-job. The only ones I know that have "plenty of time" are unemployed or students... that is a small sub-set of the available talent.
I also wanted to make sure that people that wanted to commit a larger amount could weed out people that are only able to commit to a few hours per month.
Finally - we were also thinking about the possibility of people such as lawyers/accountants joining up - who would in fact only need to commit an hour or two per month to add value. Obviously this means the site is open to much more than just equity-share/co-founder arrangements
I also wanted to make sure that people that wanted to commit a larger amount could weed out people that are only able to commit to a few hours per month.
Finally - we were also thinking about the possibility of people such as lawyers/accountants joining up - who would in fact only need to commit an hour or two per month to add value. Obviously this means the site is open to much more than just equity-share/co-founder arrangements