From my perspective, I would much rather spend the extra 50 - 100 on a guide. There price is higher for a reason ie:experience. These guys are going to know where to catch the fish and create a great experience for their clients. If someone is offering a guided trip down the bow for 350-400, I am going to ask myself why so cheap. When you break down the rates to per/hr, it isn't alot of money after expenses.
So to all you guides, Kudos for doing what you love