I could sell mine and make a profit

no no no no no bad idea :bonk:

its a great lens, wouldn't sell mine in a million years, but ditto on the stories, bought mine off digital depot,
Tell me about it.
Way back in 2006-2007 I was seriously considering going for the 300mm f/2.8L IS USM but it was always that little bit more than I could comfortably afford.
I was watching the dollar price and in 2007 the prices were as below - clipped from an old post of mine;
300mm f/2.8L USM IS from UK $6019 = £2935
300mm f/2.8L USM IS from US $3849 = £1876
I thought I would wait until it dropped to the dollar equivalent of £1500 as that line of though seemed reasonable as the price had been falling continuously...the previous year had them at;
B&H (US) 2070 GBP = 3850 USD
Park (UK) 3119 GBP = 5799 USD
Well needless to say the price had bottomed out and from there just went up & up
Many togs who are selling their 300mm f/2.8L & 500mm f/4L today are selling them for more than they paid for them new so if bought at the right time the original owner could have had 5 years use from either lens and still sell the lens for more than he paid for it!
Canon hasn't helped by pricing the MKII versions of both lenses at such ridiculously high prices so for most people looking for one of these superb pieces of glass the only choice is to buy
second hand and the sellers know this.
Supply & demand at work I guess...I have seen the 300mm go for £3.5k and the 500mm for £5k+
Good or bad news depending upon which side of the fence you are on...
-=Glyn=-