If private trackers/sites don't appeal to you, then don't use them. simple, no?
However, if you use public trackers to download copyright-sensitive material like HBO titles, FIFA gaming titles, and major movie studio titles from Dreamworks, Paramount, Fox etc, you are putting our vpn at risk. Private trackers are less likely to be monitored by the MPAA/RIAA.
So even if you do not find their speed beneficial (like a ton of us do), and are put off by seeding, then at least consider the added protection they offer.