[wil421]

I can remember someone denying me an invite to a private tracker because I might “hurt his ratio”. He eventually relented but it was a hassle. My internet was faster than his at the time so it was a factor for sure.

[legopelle]

Many private trackers may ban you if one of your invitees misbehave.

[crtasm]

Was he giving you access to his account? I can't see any way that inviting you to register your own account could let you affect his ratio.

[wil421]

The admins could mess with your ratio if someone you invited wasn’t seeding.