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This has to be a regional thing. Here, 90% plus of receptions are served buffet-style. If I don't eat it's my own fault. Usually the couple or especially one of the parents are INSISTING we eat. Sometimes they offer us lunch earlier in the day too. We make a habit of going through the line after the wedding party and family has gone, just before the rest of the guests, so we can eat and get right back to work quickly and be 100% good to go when they start in on cake cutting and toasts. The last time I was served a vendor meal (only occurs at plated dinner receptions), I and my 2nd were given chicken caesar wraps and truffle fries and honestly, they were excellent. I was forgotten ONCE this year - plated dinner in a hotel ballroom, on a long day, a HOT (106 degree) day - and the coordinator took us to the hotel bar and told the waitress to make sure our food was #1 priority so we could get right back in there. I had to pay, but oh well, the food was great and it happens. And we got it VERY quickly.
In 115 weddings shot, I've been "forgotten" 3 times. All plated meals. The first the hotel chef made us cheeseburgers and fries and we ate them back in the kitchen (LOVE this venue - they have always taken good care of me), the second was out of town and the bride was HORRIFIED when she realized we weren't on the food count (we'd gone downstairs and ordered at a restaurant on the ground floor of the venue, which also housed a museum and had a food court), and the third was the aforementioned hot day when we went to the hotel bar and ate.
It's really not that big of a deal. Again, maybe it's regional due to the vast majority of our receptions being buffet style.