Can't guarantee a full section the whole shift, most will only have a few tables the first hour or two and same for the last hour or two. They will be cleaning, doing side or busy work for 3 an hour. Also, most restaurants only allow their server to have a 3-4 table section, but use the teamwork concept, ie help take food to other tables, refills etc., on top of that, the tip out a percentage to the busboys, bartenders, hostesses, and some times for silverware rolling etc based on sales. So if you have a 100 tab, and tip 5 bucks, they tip the bar and hostess staff 3 whether they did anything or not, so you just left em 2 bucks.... Start tipping better.
Instead of tipping better, maybe, just maybe, the restaurant should stop taking tips from the wait staff making 2 bucks an hour and giving them to someone making over 7 bucks an hour. This practice is one of the reasons I tip a few bucks on the receipt and throw another 5 bucks or so in cash. I hope they keep the cash under the table.