Can’t say I’m surprised. Returning to the backbenches after being PM can’t be easy, although others have done it before him. Given the Brexit vote, I suspect history will not be kind to him.
Begone scum - first reaction from his own side: Cameron resigns, again. Breaks his word, again. Trashes his reputation, again
Too much money to be made talking more shite.
It would be difficult returning to the role of a typical MP. Cameron’s statements would get far too much attention. Distract from the new PM.
He can’t do the job if he can’t forcefully advocate for his district’s interests.
Private opportunities probably played a part too. Book deal, speaking fees. He’s got a family to support.
No, it’s normal. As the link suggests.
Not enough money in it though, for this slime ball:
I was surprised he didn’t resign as an MP the same time he resigned as Prime Minister.
Now he can get the really big bucks in business.
As a matter of routine, Cameron will be offered a seat in the Lords. All ex-PMs are offered this. So he can continue a (low-key) parliamentary career if he wishes to.
Is that still the case? IIRC the last PM to be given a (life) peerage was Margaret Thatcher.
Technically, Cameron didn’t resign his seat, since that’s not possible for a British MP.
Rather, he accepted an office of profit from the Crown, likely the Warden of the Chiltern Hundreds, which results in his seat in the Commons being vacated by the operation of law.
A fine distinction, of course. 
Tony Blairannounced ahead of time that he would turn one down.
So did John Major, and Gordon Brown is rumored to have been offered and declined one as well.
The National Scot is reporting it was indeed the Chiltern Hundreds.
She was the last to accept it. I think they are all offered it, when they retire from the Commons. Major turned down a peerage but accepted a knighthood; Blair turned both down. Brown only stood down from Parliament last year. I assume that he was offered a peerage in the 2015 dissolution honours, but I can’t find any confirmation that he was.
You wouldn’t, unless either he or the Palace “let it be known”. When it comes to ex-Prime Ministers, I rather think it’s up to herself, or at least, she wouldn’t expect to wait for a formal recommendation from the new PM.
No. Political honours (and all offers of a life peerage are very much political honours, as are all offers of anything at all to an ex-PM) are very much a matter on which the Queen acts strictly on the advice of her ministers.