No sorry LadyAnita you are notgetting it. Your comparisons aren't logical.
IFAs don't need a large number of staff because their remit is simply to recruit, train and approve foster carers and then sell them to the LA at an immense cost, and provide a support social worker to the families. I don't know the actual rates now as I retired in 2004 but I know that 10 years ago, IFA rates were excessive and a real drain on LA budgets, and that was before all the recent cuts.
The personnel that you quote as being employed by the LA are in no way all connected to the Fostering Service. Not all of the posts you mention will be in Children's Services. LA social workers have a very wide remit and have statutory responsibilities and LAs organise themselves in different ways but all LAs will have a Child Protection Team, a Children with Disabilities Team, a Duty and Assessment Team, a Fostering and Adoption Team, family support Team etc. Some of the personnel you mention won't be employed by the LA Children's Services, although I think in the years since I retired some services previous outside of LA SS Departments have been incorporated into the support services, so LAC nurses and psychologists may be part of an Integrated Support Team and social workers are now placed in schools although employed by Children's Services.
Child protection is an extremely important part of LA Children's Services and is a very stressful job and when children are removed from parents and the LA social workers have to request the court make orders so that they are not returned to unsafe homes, there is an enormous amount of work attached to that, and the same is true for all of the other Teams that I have mentioned. There is too much detail for me to go into here, but please be assured that your comparisons are fundamentally flawed - the reason that there is "no cash in the fostering coffers" as you put it is because of historical budget constraints, budgets further depleted by having to pay excessive costs to IFAs and this coalition taking an axe to already constrained budgets.
As far as salaries are concerned for the past 15 years of my employment for a LA I managed a Fostering and Adoption Team of 10 workers (and we covered a large geographical area) and my final salary on retirement in 2004 was approx. £30,000 (after 25 years in the job) My son at aged 25 was earning that in IT after 5 years in the job, and I drove a Ford Fiesta.
There were several IFAs in the area in which I worked and the directors were driving Porches and one of them owned a string of race horses (and they don't come cheap!) I imagine that if I was still in my LA post I might be on £35-£38,000 and there is absolutely NO way that an IFA director is going to be on such a salary. Suzylee says that less than 30% of the charge to LAs goes on carer's salaries, so that leaves 70% of whatever the IFAs charge LAs to be spent on their 5 employees, overheads and their own salaries. The problem is IFAs will not divulge what they charge LAs (and certainly not to their families) for obvious reasons. I only knew because I worked for the LA and I know it was excessive. IFAs don't even explain to applicants how the system works, that they have to "sell" their families to the LA.
I don't know how better to explain it and it's late and I should be in bed!