Trouble with someone's gravy argument is that the OP opened this thread to ask what was proper on the clay field and not in the duck blind. As long as he wants to talk about the makings of gravy, is sitting in the blind really about making gravy or is it about sport. Which is the more economical way of putting meat on the table for most shooters would be an entirely different thread topic, but for most shooters wouldn't a trip to a market or farm be a lot less expensive when the cost of guns, gas, time, practice, ammunition, and all expenses of bagging those birds are factored in? One can easily spend the budget of a small country at their local Cabellas or Bass Pro.
As for turning their noses up at field gun shooters on the clay field, there is little of that but some. Most experienced clay shooters are concerned by whether persons with apparent no idea of clay field safety and etiquette will screw the regular shooters day of enjoyment. Then there are some snobs, but how about the snobs in the duck blinds? How welcome are green shooters that are likely to interfere serious shooters day of taking birds? Those are there more for talking, smoking, and having a good old time even if they disregard safety.
If you didn't notice, even the "gun snobs" with their competition guns more often than not own inexpensive hunters to take to the woods and many of those snobbish clubs hold events where everyone shoots inexpensive pumps. Moreover, many of the members of those snobbish clubs shoot clays with the same guns they use in a blind.
I remain more than amused by those who think that asking shooters to comply with safety rules is snobbery.