I got a PFAW a couple months ago after about 6mths and £2.5k and then another £1k for insurance and launched my company at the start of this tax year.
Is it worth it? In £££ sense not yet, hopefully in the future, I have no family or mortgage so my needs may be different to others, I've flown a P2 as a hobbyist for a while and it was a chance to do something I love. In the learning sense, yes, getting the PFAW has been an experience, I'm glad I did it.
Some people are making good money, but it'll take time (this was my mindset), like anything, yes if you're really good, in the right location, or lucky, have the right equipment etc it all helps. Estate agents, for example are getting wise to people turning up with a P2, GoPro and no PFAW because it also generally means they're not insured commercially. And what the non-PFAW charge are too cheap to compete with, for me anyway.
But don't think estate agents for example are going to give you loads of work even with a PFAW, I1 or even an Octocopter, not in my experience anyway.
As for aerial filming, maybe, especially as you're in the business anyway, it's certainly an advantage and if you want to make "valuable consideration" you'll need a PFAW.
Flying and filming in and around built up areas are a minefield in the UK even with the relaxing of the CAOSC rules, so some companies may hire in pilot, but It'll be your PFAW and Insurance on the line.
IMHO I don't think a PFAW makes you a better pilot but it does make you more aware of your surroundings, weather patterns, no-fly zones, aviation maps etc etc
We all have duty of care whatever we fly, the CAA rules don't make it easy on this small island and it could be worse if someone starts banning whole parks, even English Heritage sites, the one I've visited anyway, seem to have sign up saying no aerial photography.
As mentioned on here before, enjoy it and fly safe. And best of luck!