Though I give 20 at times, I think listing a 20% minimum is ridiculous IMO. When did 18% go away?
I remember when the norm was 10%, then it was 15% for many years. Now I thought 18% was the norm.
I like it when the tips are precalculated and I can just pick one and not have to do the math, but I've never seen it start that high. The ones I've seen are something like 10, 15, 20 or 12, 15, 18 or 15, 18, 20. Although I've seen some go higher, I've never seen 20% as the lowest.
In my state there is no lower wage for tipped positions, so now we're tipping 20% on top of their generally above minimum wage jobs. (Minimum wage jobs are more likely NOT tipped positions like fast food.)
Don't get me wrong, I loved it when I waitressed because I made bank, (and that was back in the 10% days) but as a customer it's ridiculous.