It is definitely not something you have to do, if you tried it once and didn't get what you should then you could definitely avoid it for a while longer and that is understandable. I personally would love to see something with this challenge and the box, but if I don't then I do not care and I won't do anything else about it and that's fine, who cares if we are at a stage where it could be risky?

Do not put your money at more risk just because there is something here, it will be always here, if not this then something else. Duelbits is famous for having these kinds of marketing stuff, so next one shouldn't be really too long to come, could be even this month.