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Hang on, so now even you're agreeing that the cost you've given for the tyres is 'not the general price'. I understand fine what RRP means, but lfgss isn't a shop and it looks a little like you're new to selling here or just taking the piss thinking you can justify a nearly 50% profit mark up on something that's widely available at a lower price. The bike's not a 'custom build', it looks a bit like you've put some random stuff together to make a few quid and now you're pissed as it's not going to plan. Looking at the at the lack of foot retention and random frame/component/tyre choices I'm guessing you maybe don't ride fixed yourself so the forum is gonna be a particularly tough/sceptical/downright unfriendly market place to crack. Anyway, glws.
They're widely available at £30 each. Not sure it's the mathematics here that's a bit simple...