I don't think that ratios would work anymore. At least if we're talking about Amiga stuff here. The situation is completely different than in 1992. There simply isn't enough new stuff to upload. Or do you want board filled up with old crap? Ratios make people try to upload all kind of useless {bleep} when there isn't any proper stuff to upload. Or probably they won't bother to upload at all, they just look the files from elsewhere. And when there's something new, only one people get advantage of it and others can't ever download anything with their bad ratios

You won't get too many leechers even with no ratio nowadays. You'll be lucky if any people even sometimes download something from BBS

You'd better make everything as easy as possible that you could get some users.
"Elite" times are over. Demoscene releases have kept last remaining telnet boards somehow active in last years, but now even the demoscene has got too quiet too to make any kind of real competition for uploading.
And I think that seeing the name on weektop lists are more rewarding than getting better ratio... for the people who still like to use BBS

I think that keeps people uploading just as much as with ratios in current situation.
I'd say, set up the file areas, but don't make ratios.