You don't use 55g of fiber syrup per bar if you're going for Quest-like. VitaFiber is ~91% fiber by weight and the cheaper IMO syrup is ~75%; Quest bars clock in around 17g of fiber per bar and a little of that comes from other ingredients like almonds -- that puts a generous estimate at 20-25g of IMO syrup per Quest-equivalent bar. Then you factor in a little less than a scoop of protein... end cost ends up being in the $1.00-$1.20 range per basic homemade bar.
In my opinion (IMO! ha!), it isn't worth making your own bars for cost savings. Just keep an eye out for deals, as you can routinely find 12/$20 and often find 12/$18 or less if you're patient. An extra $0.20-$0.50 per bar is worth the convenience factor in my mind.
What IS fun, however, is experimenting with different flavors and variations; I made an 'apple pie' bar using chopped dried apple, walnuts and pumpkin spice protein powder that blew Quest's version of flavor (which I actually quite like as well) out of the water. But it's much more of an enthusiast thing than a cost saving thing.
