i have never used any of these "private" trackers. care to explain me what is the major difference.. well logically i would understand maybe they have good quality trusted torrents only right.. also why with the price difference.
Advantages of private torrent trackers include:
No malware on them
Extremely high speeds
Best pretimes
A very large amount of torrents which you can't find on public trackers such as thepiratebay
The price does not guarantee quality, price is based on a lot of factors, such as demand/supply etc.
Maybe you can buy something worth 5$ that would suit you better than the one at 20$ or 45$. It depends what you're looking for.
