Otherwise I'd argue the reverse. Banking, media, software etc. seem to export wealth from smaller communities back to urban centers. In this regard large urban centers can be regarded something as absentee landlords receiving grapes and oil and Amish furniture and exporting spreadsheets and compliance audits.
The difference is that city-dwellers are more economically productive (For various reasons, some of which are systemic), and, after paying for all those things, are left with a surplus at the end of the year.
Not to mention that the cost of supplying more mundane, necessary-for-life goods to rural areas is higher, due to higher distances, and the inefficiencies of serving low-density markets. This is another thing that keeps rural areas poor.
Or rather purchasing?
As a large city dweller for my entire adult life that does not bother me, but it isn't a sustainable process without those economic engines external to them.