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is this purely for FSA or is this the same for the rest of the manufactures?
It's mostly FSA, they are the main brand whose sales are completely dominated by OEM sales but also bother to advertise to aftermarket customers. People like Tektro and Novatec are in a similar position in terms of the split between OEM and aftermarket, but historically their aftermarket sales have only come about from independent wholesalers buying at the OEM rate and setting their own mark-ups. FSA was a brand created explicitly to give TH Industry a premium look, before the information revolution made it much harder for people to hide the true nature of the industry :-)
Don't be led astray by discounts on FSA products, their whole business model is based on setting the RRP at about twice what the stuff is actually worth when judged against competing products from other manufacturers. This is done to fool people buying OTP bikes that FSA substitutions for better known brands are an upgrade, when in fact the OEM price is what's driving the component selection. With £100 off, they are OK, but don't fall for the idea that you're getting a £220 wheelset at a discount, you're getting a £120 wheelset at no discount.