Is cleaning a standard off-the-shelf quality (Bosch, DeWalt, Craftsman, Oldham, etc.) 40T 10" blade and having it resharpened by a service cost effective when compared to buying a new one outright? My Bosch blade saw better days after 3 years of rough and general purpose cutting tasks and so I replaced it with an Irwin carbide tipped one for a whopping $24. Now, I'm looking at the old blade and wondering if I should just pitch it. Do old, well-used blades become fatigued? Out-of-true to the naked eye? Again, we're talking lower-end blades, not top-notch shop blades geared for more serious woodworking.