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You can sharpen multitool blades but from my perspective it's a false economy because my clients would be a little upset if I stood around all day sharpening blades. So, yes, I view them as consumables (the same as most other saw blades) but I do find that the Bosch ones last considerably longer than cheap ones. Assuming I'm not cutting something I know will wreck the blade I'd expect that set to last at least 6 months. A cheaper set I'd expect to last half that time at the very most.
If you find that the blades don't last long bear in mind that heat is the enemy of saw blades. This applies double to multitool blades because unlike most other blades they will stay in contact with the cutting face so there is no chance of them cooling down it's rare that I take mine off the lowest speed for anything other than sanding.
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Bobbo
I bought the expensive ones and the cheap ones and they all seem to be almost throw away.