I think I will give your service a try. There is only one question:
Can you explain why conversion rates are so unequal?
Its like buying a dollar for five dollars... What makes this exchange so expensive?
Do you have any promotion codes for us to test would be a nice
gesture to boost the traffic etc.

Nevertheless a good option for frozen simcard founds.

This is an interesting concept, let us know when you take this worldwide or to the US.