Approximate ROI% for top down bettors

[weeminer]

Anyone have an approximate ROI for very good top down bettors/groups who bet mostly spreads/totals/MLs on major US sports?

Mostly curious if they're closer to like 3% or if 5+% is achievable for some on big volume?

Only for top down bettors, not asking what originators or guys who are ahead on injury news can achieve.

Thanks to anyone who gives an actual educated answer lol.

[pologq]

i think this is tough to get a true measurement for honestly. lots of factors go in that are not consistent amongst everyone.