even if it wears at the same rate, the cassettes etc are more expensive:
http://www.chainreactioncycles.com/shimano-105-5800-11-speed-road-cassette/rp-prod116489?utm_source=Google&utm_medium=Shopping&utm_name=UnitedKingdom&gs=1&gclid=CjwKEAiAxNilBRD88r2azcqB2zsSJABy2B96Izb7jGhd4cSTLepWVAhMCWasuhNhbhIGzv_pbXXO3BoC09vw_wcB&gclsrc=aw.ds
http://www.chainreactioncycles.com/shimano-105-5700-10-speed-road-cassette/rp-prod50454?utm_source=Google&utm_medium=Shopping&utm_name=UnitedKingdom&gs=1&gclid=CjwKEAiAxNilBRD88r2azcqB2zsSJABy2B96C-zLp8EvUjeNQ_agcjLM6PD0LZ5tzdUxe-zSUQoG5xoCPDXw_wcB&gclsrc=aw.ds
It's negligible to be honest though, the rate I go through cassettes it's going to be about a penny every few days difference...
@ObiWomKenobi started
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even if it wears at the same rate, the cassettes etc are more expensive:
http://www.chainreactioncycles.com/shimano-105-5800-11-speed-road-cassette/rp-prod116489?utm_source=Google&utm_medium=Shopping&utm_name=UnitedKingdom&gs=1&gclid=CjwKEAiAxNilBRD88r2azcqB2zsSJABy2B96Izb7jGhd4cSTLepWVAhMCWasuhNhbhIGzv_pbXXO3BoC09vw_wcB&gclsrc=aw.ds
http://www.chainreactioncycles.com/shimano-105-5700-10-speed-road-cassette/rp-prod50454?utm_source=Google&utm_medium=Shopping&utm_name=UnitedKingdom&gs=1&gclid=CjwKEAiAxNilBRD88r2azcqB2zsSJABy2B96C-zLp8EvUjeNQ_agcjLM6PD0LZ5tzdUxe-zSUQoG5xoCPDXw_wcB&gclsrc=aw.ds