When I was racing BICYCLES, not motorcycles, I spent about $5,500 over a three and a half month season. Most of the cost was travel (food, gas, lodging, etc).
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That's a fair whack of cash....my Bro used to do Triathlons, he reckons that used to keep him poor....doesnt help when they charge $5000 for a decent pushbike these days!