I mean, waitering doesn't require any education, hardly any training if you're intelligent, generally someone in such a job is not supposed to be making that much.
You have much to learn. Hopefully your new job will teach you how wrong you are.
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... so I would find it strange if they made five times as much as me.
Well then, get ready...
Customers will still leave 15-25%. The higher cost of the menu items generally drives a higher level of service. There are likely also more staff with which to share that tip (busboy, water boy, etc).
Nevertheless, the top waitstaff at your restaurant will be making more than you.