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Why? Other than just 'because trade'
It's just stuff. You can buy all the parts to put a PC together despite that not being your day job. Likewise bikes, likewise just about anything else. I'm not asking them for their expertise and they're putting no more time into selling to me than they would someone in the trade.
You'll get better prices if you buy lots, but that's separate to having an account with them, and I wouldn't expect I'd get preferential rates if I'm buying small volumes.
But when I was boarding out my loft for example then it was cheaper for me to get Selco to deliver than for me to go to B&Q. Sod paying extra for the same pieces of chipboard just because it comes from a B&Q warehouse instead of a Selco one.
I used my 1 man IT Contractor Ltd to open a couple of 'trade' accounts.
Then just bought stuff with my own card.