Comment by atlasunshrugged

I don't know about 'constantly' but I think once you're 8-10 months into a gig it doesn't hurt. For one, it gives you some real data about your market value in case you want to negotiate at the end of the year for a raise/bonus and second, it's just good to keep these skills in practice just in case of a layoff or you want something better. A bit time consuming but I've found it useful.