I don’t normally have much of a problem with single source supply. It allows a distributor/seller to specialise and concentrate on the product, however when that exclusivity turns into a monopoly because the product is popular, there is always the danger the supplier will use that monopoly to squeeze their customers’ last shekel from their hands, just because they can.
This is bad for the customer of course but also for the manufacturer because the product gets a bad name which results in reduced sales of ‘it’ and by association the manufacturer’s subsequent products.

Where monopolies are concerned they don’t come much bigger or longer standing than AT&T in the US and O2 in the UK.

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