I went to Loft 18 (virtual golf and games) this weekend with a small group and prepaid for a "lane" for two hours at $60 per hour. I set it up online myself a few days before and when I came in, all the front desk rep hand to do was pull up my reservation and turn the screen around for me to pay. It had the tip prompt! There was no way I was tipping 20% on top of $120 for a screen flip! I declined the tip completely.