Someone I know recently got a tattoo done. As they were on the table a second artist came over and said "wow that looks good".
Sure the tattoo does look good but I can't help but think that this is just standard procedure. When the customer is just wondering "is this a clever thing" they received a positive affirmation. In marketing theory this is called dissonance reduction.
The staff probably don't even know that that's what they are doing - just that it makes their life easier. Or perhaps the other artist really just did think it was a nice tatt.