Console GPU's are virtually supplied at cost, there's hardly any profit in it, hell Sony/MS sell the things at a loss for ~3 years to try and grab market share. The reason ATi/Nvidia made console GPU's for the previous two gens was because it was good PR/publicity not because it made big money.
No they aren't, it's highly profitable, most importantly because AMD is selling them the chip, not the IP. Look at ARM, they have a fraction of the revenue AMD does despite getting income from IP of probably billions of chips a year now. Devices > chips > ip in profitability, to a degree a magnitude of difference each time, though so many people sell devices at a loss for software now. Consoles, phones(some), tablets(some), while things like Iphones, mac's in general all charge a massive premium and generate a profit way above what they could if they were selling the chips to someone else.
ATi only had an IP deal on the 360, Nvidia sold chips to MS for the Xbox, but got in a huge fight over pricing at one stage which is what made MS go Ati for the next console and many people would suggest that Sony went Nvidia less because they wanted to go Nvidia and more because MS had already signed up ATi and they didn't(or maybe MS paid them to be exclusive) want to go the same way. AMD is supplying for certain the chips for the PS4 and recently it's being suggested they are selling chips to MS as well though previously it was thought that was an IP deal.
Either way both will make AMD a very decent wedge of cash in the next 5 years, WAY above the current console deals for AMD or Nvidia, supplying bigger chips, selling the actual chips and not IP.
AMD's console specific income was said to be 50-100mil for Q3 and aiming at 250mil for Q4, that was what they've predicted throughout most of the last year. Q3 has already proved true, supposedly due to demand at least Sony has upped their production so Q4 could be even higher. Console sales start more slowly, that 250mil a quarter figure should increase before it goes down in later years when the chips are being made on newer processes.
Nvidia were dumped from the consoles, simple as that, they couldn't remotely compete.
APU all in one chip was completely unmatchable in cost by Nvidia/Intel or Nvidia/AMD non APU, and on power as well. When you get to competitive companies trying to mix parts and coming up with new interconnects... AMD had the consoles in the bag when they bought ATi and actually made a decent APU, no other company could offer a cpu + gpu that were designed to work together above arm/mobile level performance.