Few things worse in a restaurant than being seated in "no man's land". Watching other patrons all around you getting drinks, orders, and food while you have yet to make contact with anyone.

I understand if they're busy and can't get to me immediately. At least acknowledge my presence. If nothing...I'm out of there. And no...I don't leave a tip.

For even when we were with you, we gave you this rule: "If a man will not work, he shall not eat."

2 Thessalonians 3:10