Smart move, a gradual investment makes more sense in your circumstance as trying to rush in will cost a decent amount extra due to needing vouchers. I have similar plans for presale as you (Our SPS staked is similar).

For general sale its likely I sell all my early vouchers. I highly suspect that the voucher system will be removed sooner rather then later. I hate to even say this but there is a decent chance the vouchers become too big of a detterent for new users and boosters sales slow down more then expected. Forcing the hands of the devs to remove the voucher system earlier then they would of liked.

My strategy is a gamble of the voucher system failing / being less succesful then anticipated. It also allows me collect boosters for "FREE" or at the very least collecting boosters while not spending any of my current currencies.

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