if leechers more than seeders then it is a good idea to download the torrent
1. If it is pack chances are likely that people are downloading a certain segment of it so though it might seem that there are a lot of leechers in actuality they aren’t leeching much
2. Old torrents are risky bit torrents prefer clients which have already downloaded and upload a lot of data when you get into the pool of such old torrents with multitude of seeders already you will find that even though there might be leechers you wont be given as much preference.
if seeders more than leechers then it is a bad idea to download the torrent.
1. Sometimes you might find that a new torrent might have 0 leechers but if you have an idea about how many times a average torrent gets downloaded then you can download it and seed , there is a good chance that you will receive leechers eventually
Also most of the trackers have a free torrents , if you download don’t get disheartened soon let them seed for a while eventually you will find that these torrents will help you in building your ratio without hurting your download status