Flare, the vouchers are crap. And you can find them just about anywhere, so what’s the point in inviting people?
Here’s what you should do. Toss out the Voucher system, and give wind boots. Yes, wind bots. Custom wind boots. These wind boots start out at +0% speed, but gain +1% boost with each successful referral (reach Lv.50), up to a maximum of +35% (the highest in the game, I think!)
Here are the results:
It would get lower-level players involved, since vouchers never help lower-level players. Why buy food when food is plentiful down there?
It would get top players involved too, because it would offer an item that could not be obtained by any other way. Granted, it would take a lot of work finding 35 friends who’d reach Lv.50, but you’d have people advertising their asses off trying to accomplish it.
Would finally give a REAL reward to people who advertise your game -__- Right now there’s no incentive.