I don't believe you need to have a PB to make sets that suit other people's needs, though that is what I look for in SetupGrid...
I've personally made sets that I just love... and I can't take sets that other people have made. They either oversteer like crazy (maybe because I suck with throttle modulation), or the tyres don't warm up fast enough (I am not pushing it hard enough). In any case, sets as I have known, are made to suit yourself. ----- On a side note, working with a PB set may help you work towards driving like him/her. The XFG sets for example don't work for me because I may just suck at driving! :sigh: I may need to learn to gradually open up the throttle, or adjust to the amount of understeer at corner exit.
I remember making a drift set for XRG (AND I SUCK AT DRIFTING IN ALL LFS (ACTUALLY EVERY SINGLE IN THE WORLD!) CARS when I was still driving DEMO. It doesn't drift and get you 50k pts, but I still like it! I remember hearing from this DEMO driver after posting it that he liked it also.