Take any given size 'pot' and the provider will usually make more from it than they pay out to you.
I don't know if that's true or not, all I know is that if I calculate the contributions to my 20 year company pension it makes up about 30% of the current size of the pot, so I'm getting money for 'free' (yes I know how it really works), I couldn't care less if the pension provider also makes a living. I'd be cutting my nose off to spite my face if I gave all that up, not to mention the tax efficiency (which can be considerable depending on your salary).
I won't be changing the advice I give out to younger family members!