If a user goes to the dealer for doing a recharge of 398 then one voucher of dealer will b utilised & only 348 will b debited from his account but he'll take 398 from the customer. So, ₹50 came to his pocket. Same thing he'll do with the rest 7 vouchers & after that he'll again do a recharge in his mobile number to get 8 vouchers.
So, overall his own recharge is absolutely free. He is not spending a single penny for doing recharge.