I don't see the problem. This is business we speak of. It's allowed to charge what it likes, and you're allowed NOT to pay it. Tell them to go whistle or pay it.
Same as you're allowed to resign from your job / charge your customer more. My offer of £50 for your S2 stands, and you're entitled to tell yours truly where to get off, or take it. Equally, you can ask £250,000. Er, and?...
You might not like it, and fair enough. They've done their numbers and know that the majority are too idle to move at renewal, thus will simply pay it. They offered you the lowest rate at proposal to grab the gravy 2-3 year on. Now it's gravy time. Good for them.
And in the same way, as you became more useful to your customer or employer, you got a pay/price increase. Good for you. Did you turn it down? Did you hell.
OP got it for £129. He walked. Good. See... it works.
Why do we feel an entitlement. Where's the problem?