We didn't face with such issues before. All our customers received their money in a few minutes. If you'll be the first luck person, who won't get paid, just send information to our group or directly to support and we will make a refund.
If you mean first unlucky person, than I hope not but I hold you for your word.
Problem I noticed is limited support only for Advcash cards that are still not available in many countries around the world, so it would be a good idea to support other card providers.