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Maybe sundries wasn't the best choice of phrase. I guess I'm talking about a bit of clear silicone vs £15 Elephant's Foreskin coloured silicone to match these particular tiles which you probably can't use before it goes off. Or a couple of screws to attach something vs 20,000 screws to build your decking.
As to the charging more for the first hour - again trades vary, but that doesn't seem uncommon or unreasonable to me. A mate basically adds 2 days to any job under a certain timeframe to account for setup/cleanup. On a 1 day job that obviously X3 the cost, making him potentially uncompetitive, but that's him pricing according to his costs.
Doesn't work that way, some of the sundries (repaircare epoxy resin) are too expensive to include in the labour rate and it would mean the 1 hour jobs I do on the bike are also paying to run the van.
Another thing I've never done but will have to start doing is double the labour rate for the first hour. I can't do 8 hours of 1 hour jobs in a day if I'm going on the time I arrive on site.
Your final point, yes, a lot of people will be using materials they know and trust. Nothing worse than getting crappy materials that slow you down or mess your s**t up.
The bike shop analogy is fine.