I've been in sales 9-10 years, I put in the hard graft (late nights, 12-14 hour shifts, smashing the phones, emails, dinners, drinks, network building, numbers game etc) and last 4 years I started my own firm self-employed.
I now automate my outbound BD (business development), limit cold calls to never doing them and use my existing network (23,000 relevant connects on LinkedIn) and also trade/invest as a side hustle.
I'm an extrovert which helped to start, since covid/starting my business/WFH, I've felt that energy fade but still have enough in the tank to get sh1t done.
10% commission doesn't mean anything on it's own, you could be pulling 10% on a £1000 deal or on a £250,000 deal. My typical terms of business are 15-20% UK and 20-30% EU/U.S/CAN. For example last week I just placed a dude on €120,000 base at 20% earning me €24,000 (£20,000) and as it's outside of the UK I pay (and charge) 0% VAT (value added tax). On Monday a guy started as a contractor for me in Belgium earning me £1000 per month for the next 4 years. My biggest single deal working for a firm was £51,000 of which I took home only £12,750, you do that enough times and you realise you can do it for yourself and take it all.
Sales commission depends on what you're selling and the frequency. I prefer slightly bigger hitters that I can get a quick turnaround on. Less work and stress, bigger chunks of cash consistently. If you are good at sales and have the ability to pull clients, starting your own firm is a life changer/no brainer.