I'm sorry you're not satisfied with our support on the forum, but please remember that our "official support" is through our support ticket system (as mentioned in the forum guidelines). I still recommend searching and posting to the forum first as it gives other people the ability to search for the question and answer later (as opposed to our ticket system, which doesn't allow people to quickly find answers to previously asked questions).

As for responses to questions, I respond to certain questions first if they're quick to answer. For questions that require more work to answer (eg. testing, figuring out what's going on, etc), I leave till I have more time to go through it. However, sometimes these posts slip through as I track things by new posts and only re-check for unanswered posts every couple of weeks.

As to your original problem, I just tested it and it works fine on my test installation. I'm not sure if the manual mentions this, but the code only counts outstanding paid links (ie. expired paid links don't count, nor do free ones) towards the count. So if you have 2, 10% and 10, 15% discounts, then the user would need to have 1 paid link when they purchase the 2nd link to get the 10% discount on the 2nd link. They will get the 10% discount on all link purchases after that until they hit their 10th paid link (assuming all the other previous links are still unexpired), where they will get 15% off.

Adrian