I would first say that the best thing to do would be get some files and vices and learn how to put an edge on our ski yourself. That said, the next best thing would be to get yourself the weekly deal if you can afford it. That is of course if the shop is willing to put that final edge on the ski by hand. Hand tuning is superior to machine raping and dont let anyone tell you different.
If your skiing 5-7 days a week keeping your boards tuned will improve your skiing and will probably increase the ski's life. Letting rock burn, blown edges and core shots go unrepaired for a long time makes it all that more difficult to fix when you finally do drop them off at the shop.
One thing though...I assume you're living in a ski town and have a varied choice of shops to choose from. Just be sure the guy who is pulling the file is not some bozo from Hoboken NJ taking a year off from school. Competent ski tuners are a rare breed and when you find one you must not only pay them but you must offer the appropriate tribute in the form of their preferred libation. Usually a six pack of Guinness will suffice but other substances could increase your milage