We use the corks that are supposed to keep the wine fresh as well, but after two days on a red we poor it out, the bartender writes the date on the lable when he/she opens it. The whites will last about 4-5 days.
We offer our house ($2.89 bottle cost) by the glass $6 and then only one other of each varietal by the glass. I price the wines by the glass as close to the bottle cost as possible. The mark-up on the house will help on the wastage of your other wines by the glass.
As Brandon said know your market, will your patrons be willing to spend $8 a glass or $14. If you feel they are in the $8-$9 range, then offer the wines that fall into that cost catagory by the glass. We run about a 36% wine cost, mostly due to the mark-up of our house wines for the restaurant and banquets.
We do end up pouring out a lot of wine, be sure the wine by the glass will move. Pair your menu items with your wines by the glass and print them on your menu. Educate your servers (sales people) on wine knowledge, I post a blurb about wine, beer, whiskey or food weekly on the bulliten board Your distributer should be happy send a trainer out for a wine seminar.
The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over. -HST