Right. Unlike Guest, I actually remember when I promised to do something and have come back to leave my thoughts.
I don't think she's getting £10-15K for a straight corporate speaking gig on the regular. Possibly for something like the disastrous Curry's collab, which we know must have been arranged through Kruger Cowne as Agent Adrian was there, or for a big Google-type thing. Small literary festivals like Clitfest, Hay etc pay crap (maybe a couple of grand if you're *really* lucky).
However, I actually agree with pretty much everything she says about how to negotiate your fee - far too much of the public speaking world relies on the fact that people want a platform, so will do stuff for nothing or just travel expenses. But if you're self employed, then this stuff is your job, and it needs to be worth your while - either monetarily or in terms of genuine exposure/opportunity or an incredible fun experience (fun, fame or fortune).
For example, I was approached to speak at an event in a European country. I would have had to spend at least half a day preparing for the event (plus also packing, sorting out logistics etc etc), most of a day travelling, the full day at the event, then most of the day travelling back - two nights away from home in bed that I might not sleep well in, and I have a genuine chronic health condition that means stuff like that does wipe me out. If I get in really late from an event where I've had to be on my feet all day, I am under par for at least a day after that. So I have no problem with factoring in half a day of recovery time.
And, of course, I wouldn't be able to get on with as much of my other regular work, as it's hard to work properly when you're travelling (i've tried - it's tiring and stressful, it's hard to do client calls on the go, and I hate being beholden to my laptop battery and finding wifi). So, let's call it 4 days of working time that I need to get covered.
Now, I'm a highly experienced Frau and an expert in my field, and when I was a freelance in a usual year my income was around £60K. According to this day rate calculator, if I want to make the equivalent of a £60,000 salary, I need to charge a *minimum* of £350 a day:
https://www.maxwellstephens.com/day-rate-calculator (these things usually assume you're working full time, with about 4 weeks holiday a year and a couple of sick days).
So, I would need to ask for AT LEAST £1400, plus travel and accommodation. And that's not including any other expenses that I might incur while I'm away for three days, like meals, snacks, or a couple of glasses of overpriced red wine that I'll have to drink on my own in the hotel bar. Oh, and if it's arranged through an agent, then they will take a percentage of the fee (10-20% depending on your deal, although it's usually worth it as they'll negotiate a higher fee than you would ever manage to yourself). Now I run a company, and they bill me out at £1200 a day, so that would be a minimum of £5K, as that's how much we would lose due to me not being able to get on with other billable work or any of the other jobs I do. So no, I won't do it for £200, or for free
If your experience and expertise is valuable, then people should pay you for it. It drives me nuts when organisers of events aren't willing to pay for the time of the people who are the reason the event exists in the first place! I think guest's advice and rationale is fine, and more people should take it to heart. Where I differ is that I'm genuinely an expert and an authority on what I do, whereas she's a honking chancer who keeps trotting out her self-centred poverty fiction.