It's all relative.
Spending $250 for a burger one time for a special occasion or maybe just a special treat for yourself if you've got that type of money to blow, is no worse than blowing a few hundred bucks for food and drinks and supplies or whatever for a party that is every bit as unnecessary as eating that burger. Or spending a few hundred every other month on beer and cigs or whatever else is equally unnecessary or a costly non-necessity.
To elaborate on what gregg said..........
I wasn't even in sales and I bought my share of +$500 lunches and diners when I was taking customers out, and I can tell you if I knew of a place that sold $250 burgers back then - or even more expensive ones - I would have taken my customers there at least once, possibly more than once - and why not?
The company I worked for gave me the green light to spend the money - and I can tell that you those lunches and diners that seemed expensive were nothing of the sort because they helped bring in literally millions of dollars worth of business - we had so much engineering work that our 150 employee company grew to over 400 employees in about a year, everyone was working a schedule of unlimited hours with overtime, double time and even triple time + bonuses and we were still understaffed - we even sent work out to other engineering firms. In the scheme of things, what seems like insanely expensive meals was nothing of the sort. It's all relative.
How about alcohol? Ever had Remy Martin Louis XIII Cognac @ $200 per shot? Never have I ever had anything better to drink ever in my entire life and I'll never forget that stuff till the day I die, I thought it was that good - the stuff is beyond amazing in every aspect IMO, but is it worth $200 per shot? Not today, not for most and not for me at least, but back then it served a very worthwhile purpose and was certainly well worth it - even at $200 per shot. Was it gluttony? - I don't see how it was and comparatively speaking, it makes a $250 burger seem cheap.
I do not see how a $250 burger is gluttony unless perhaps you obsess over having to have it or something like that. Far as that goes, some people would think spending $9 for a burger is a sin or $80 for a steak or $50,000 for a new car or $300,000 for a house or etc. I think it's all relative - after all, you can't take it with you, so give away what you can, save and spend what you can on what you want, if that be the occasional $250 burger, I think you're nuts, but so be it. After all is said and done, it's only money.
I think anyone who spends $250 for a burger is either rich enough to afford it, has money to blow or has the company expense account and just wants to try it, or is just stupid - maybe all of the above, but I just cannot understand how for the majority of people, it could be a form of gluttony.