The best trackers have some pretty strict rules regarding IP-addresses for this exact reason. If you're suddenly browsing the site from a completely different location, it could raise flags. If you're moving country or using a server/VPN (for browsing, not downloading), you might need to notify staff about it.

But as a general rule, if someone claims to sell invites to the top-level trackers it's probably bullshit anyway. They are very closed down.