I don't believe you can buy RTC after the crowdsale as they will be burned if unsold during crowdsale.
Yes, i think you will be able to buy RTC after the sale only on exchanges,but now its the time to invest,with this bonus.Early bird gets the worm
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Understandably, the best time to buy a token is during pre-sale because of huge bonuses
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True. It is best for investment but interestingly enough more people buy in later stages when they have had a chance to study more of the material, sometimes even a beta or MVP.