You can have 3 options about my simple ref exchange.

option no 1 : 2 for 1 exchange ( no cost to you)
option no 2 : 1 for 1 exchange (cost 1$ per referral/ keep for life)
option no 3 : 1 for 1 renting (cost .30 cent/ month) *with 100 clicks

You (will) register under Joe (site 2)...and
Joe (will) register under You (site 1)...and

You+Joe (will) register under (site 3)..for my effort to match both of you together!

Recap; it is a 2 for 1 (exchange service)

You (will) register under Joe (site 2)...and
Joe (will) register under You (site 1)...and

You+Joe (will) pay my service only 1$ each ..for my effort to match both of you together!

Recap; both pay 1$ per site for the match up! (pay 1 time only and keep your referral for life)

You (will) register under Joe (site 2)...and
Joe (will) register under You (site 1)...and

You+Joe (will) rent each other per month and will pay me .30 cent/month..for my effort to match both of you together!

Recap; it is a cost of .30 cent for each (renting service)