How about, instead, you just list the maximum amount of revisions you will do in your gig packages, and then stick to that number of revisions. The maximum number of revisions that I do in Gig Packages are unlimited. If someone order you for logo design. And you deliver it on time and after that you don’t get any response for a couple of month. After 2 months the buyer come back to you ask you to change the color or font. Will you make the changes?