I've been reluctant to run much except for the website generator on 
c-l.net.  This doesn't run very often so I don't think it's a burden.  For my other work, I use my own machines so as not to load 
c-l.net too much. (But CI doesn't run very often on my own machines---maybe a couple times per month, but tends to be very bursty depending on how much free time and motivation I have.)  I also didn't want to interfere with trac and gitlab for all the projects on the site.