Its a great deal Doob, but I cant say I agree with you in 70% of cases. Let me explain it as I see it.
Take a 3t swivel dumper. Nothing special, not road registered or hydrostatic, just a 3t manual dumper. Worth around £15k new.
Lets say you keep it for 10 years and its worth £5k when you sell it. You service it every year at £250, Insure it £250/year, store it when not on site £500 (which is a fairly low estimate assuming its out on site most of the time). It might need a couple of new bits, tyre etc in its life time, lets assume £1000. Over 10 years that dumper owes you £25k and you sell it for £5k so its cost you £20k.
At the higher rate of £140/week to hire it needs to be out for 2.7 years flat out to pay that back. Now over 10 years you would hope to have it out on hire for more than 2.7 years, however when I look at my dumper usage, its surprising how much you always need a different machine, 1t here for access, 6t there for bigger sites and I've deliberately chosen a 3t dumper for my example as its probably one of the most used ones with my 2.8t excavator.
So by hiring the dumper, I have the flexibility to off hire it when I don't need it, saving storage, I don't have to service or maintain it and I don't pay anywhere near £250/year for my hired in plant insurance. My point being that if you used one all the time, its worth buying and taking the risk on getting the future work to keep it busy. But with hire rates as cheap as they are (and I'm sure someones getting better prices than I am here even with my £105/week long term rate) its not worth the hassle owning.
That's why I bought my 8026, its out earning almost every day. And why I wont be upgrading my old 801, because its not out much and I'd rather pay my mortgage off than have a fleet of brand new machines to play with (as nice as it would be!) Everyone has different circumstances and a different business model. If new kit on finance suits you and you are keeping it busy then its a no brainier. But it wouldn't work for Rory for example who has a totally different business model to you and I.