egMember is able to works with multiple membership type with customizable comission for each membership type. You set the comission method works with percentage or fixed money based the membership type.  Please see the examples below, this example work for sponsor commission and level commission as well.

 Example 1: Working with fixed money amount.
Basic membership cost: $20
Comission: $5

Silver membership cost $50
Comission: $10

Gold membership cost $150
Comission: $20

Peter (Basic) refer John (Gold) -> Peter get $5
Peter (Basic) refer Ken (Silver) -> Peter get $5
Peter (Basic) refer Marten (Basic) -> Peter get $5

Willy (Silver) refer Jack (Gold) -> Willy get $10
Willy (Silver) refer Robby (Silver) -> Willy get $10
Willy (Silver) refer Nancy (Basic) -> Willy get $10

John (Gold) refer Marry (Gold) -> John get $20
John (Gold) refer Robert (Silver) -> John get $20
John (Gold) refer Greg (Basic) -> John get $20


Example 2: Working with custom method
Basic membership cost: $20
Comission: $1

Silver membership cost $50
Comission: 10%

Gold membership cost $150
Comission: 20%

Peter (Basic) refer John (Gold) -> Peter get $1
Peter (Basic) refer Ken (Silver) -> Peter get $1
Peter (Basic) refer Marten (Basic) -> Peter get $1

Willy (Silver) refer Jack (Gold) -> Willy get $150 * 10% = $15
Willy (Silver) refer Robby (Silver) -> Willy get $50 * 10% = $5
Willy (Silver) refer Nancy (Basic) -> Willy get $20 * 10% = $2

John (Gold) refer Marry (Gold) -> John get $150 * 20% = $30
John (Gold) refer Robert (Silver) -> John get $50 * 20% = $10
John (Gold) refer Greg (Basic) -> John get $20 * 20% = $4