Pues no tengo invis de otros trackers. De todas formas, yo tengo cuenta de Oink, pero no tengo invis para mi hermano, por eso queria hacerte el cambio, para darsela a él. En fin, suerte...
EDITO: Que es eso de que te ha generado una invitación? Que yo sepa oink da invitaciones al hacer donaciones, al pasar de user+ a power user+, y una vez siendo PU+ periodicamente. Tu cuenta no puede ser PU+, y si hubieras donado, te dan 2. En fin, que es muy raro lo que comentas. Aqui pongo cómo funcionan las invis en Oink:
How do I get invites?
There are two ways:
1. Donating the minimum amount or more stated on the Donation page will make you a Donator and earn you two invites.
2. Promotion to PowerUser+ earns you 4 invites. Promotion is automatic, and happens when you have been a member for at least 2 weeks and have uploaded at least 10.00 gb and have a ratio of at least 1.05
Note that both the uploaded amount and ratio you see are rounded while promotion uses exact values, so if it looks as if you are exactly at the limit but nothing happens, upload a bit more to increase the values slightly above the limit. Abusing the automatic promotion (getting demoted and repromoted on purpose to get more invites) will result in permanent loss of all current and future invites, or even the account.
None of the invites you get will expire. Unless you use them (or lose them for breaking the rules or being demoted), you will have them as long as you have your account.
How do I get more invites after the first 2 / 4?
PowerUser+'s, who haven't lost their invites, automatically get one new invite twice per month, with a maximum of 10 invites in which case you stop getting more until you use some of them, then you'll get a new one again on the next scheduled day. In addition, if you haven't already donated, PowerUser+s too can become donors and get the two invites.