If the government gives a person far more in food stamps than the household could possibly eat in a month, why shouldn't they buy crab legs and good steaks?

In the mid to late 90s there was a 2 year period when I qualified for food stamps. There were 5 of us. I reported my income and household honestly, and they gave us an enormous amount of stamps, ~$800 worth. No way could we consume so much food in a month. If you don’t use it all by the end of the month you lose it. I used as much as I could, and I donated a lot to food pantries, but I “lost” about $200 at the end of every month. (FYI, I didn’t buy expensive foods because the kids wouldn’t have appreciated it any more than the spaghetti and burritos I made.)
What would be wrong with buying more expensive foods if the government gives you enough to do that?
If you think it’s wrong, please explain.