I think it's a good idea. I'm working on two different micro-SaaS ideas with two different cofounders and for both projects I'm using Hubstaff to keep track of the number of hours we're both putting into the project, both to make sure we're putting in an equal effort and also to get a sense of whether the money the project makes down the road (if any) ends up being greater than the market value of the time I invested into it.