My weekend is only worth more than $50 if I didn't enjoy programming it, or it took time away from making money from another job. If I was planning on sitting around watching television, but instead spent it programming this project that wouldn't somehow make the weekend worth less, in fact I would argue that it built value, intangible or otherwise (knowledge learned from building the application that I can put on my resume/maybe a few paying customers that end up actually using it/etc)
