everyone has different folios and domains... so we can just tlak about majorities and averages... and from what i hear, for best average results, it is bodis...
i tried bodis, voodoo, parking crew... and found bodis to have highest revenue.. but today parking money is so low that for most people it doesn't even make sense.. unless u know what u are doing or have some rev proven names u bought from others etc.. which is more my case.
still even at $3-5 per day.. it can sdd up to 100-150$ per month... and if u do bit traveling as digital nomad, u quickly undersdtsnd some countries on earth have people who work very hard to make 3-5$ per day. and thats all they have to live on. so it gives you some new perspective on money... value etc.
either way, i still personlly see no harm in just letting names sit on parked page.. no matter how much they make.. even if nothing... just make sure the forsale banner is nice and visible on top.. and anyone who truly wants yer name will write u.
oddly... or not... many or most domainers today, do not get most sales or offers through redirects and sale landers anyway...but asther by listing names on various markets.. and even on those, most comes from afternic and godaddy i believe.
p.s some people today still make 3-4 figures per month from parking. so itds definitely not a dead art..
i never heard of someone making now 5 figures per monht from parking.. but i am sure they exist too