Does buying spare parts of players is profitable?

New or used (working) replacement parts of new industry standard dj gear is cheaper than new one?

I want wire everything together and save some money too.

It is generally more expensive to buy every spare part for a particular model, than it is to just buy a new one. Also you’ll get a warranty on a new one.

The other consideration is that someone would need a tremendous amount of skill and experience to assemble and test a complex piece of equipment from it bending bought as 300 spare parts

Choose the model to want to buy - and buy a new one - it’s going to be vastly cheaper, it’s going to work straight out the box in 99% of cases (depending on whether your courier thinks he’s David Beckham) and it’ll have a warranty.

Spare parts have been known to be a lot more expensive than they should, so I would expect building from spare parts is way more expensive.

Even making a comparable DIY product is usually more expensive…

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