As someone who grew up as a caddie for about 10 years, and play at a club that requires caddies or carts (though there is a certain shame in taking a cart if you are under 70 and able-bodied), I am a bit flabbergasted by this discussion. In metro Philly and NYC pretty much all good clubs require caddies or carts (and the better ones don't even allow carts at all). Sure, it's an added expense, but really a drop in the bucket compared to the overall cost of membership, dues etc. In addition to carrying your bag, the caddie gives you yardage, cleans your ball on the greens, keeps your clubs clean, rakes bunkers, and generally helps you get around faster. As for pay, it's simply - you pay per bag. Sure, there are good and bad caddies, all with their own personalities, just with anything in life, but if you let a caddie detract from your round, there is probably something wrong with you more than the caddie. There is always a range of payment, so you can adjust accordingly if you have a great/bad experience (and allow kids to learn). There were always members that would nickel and dime caddies...and they inevitably always ended up with the worst ones!
I think using a caddie adds to the enjoyment of the game, and when I play Streamsong in March and I'll definitely be taking one.