@Furok, from all the sellers on this marketplace, you are the last person who would need to think about discounts. Discounts are needed for those who are trying to sell generic, low quality models, who faces lot of competition from similar sellers and have no other means to compete, but only with low prices. Discounts are also good for those who primarily are targeting hobbyists, ethusiasts and students. I think none of those conditions applies to you - you are selling unique, high quality content and your pricing is targeted at professionals. People who need such quality, will pay full price without questions and they won't wait for "random" discount events. IMO, specifically for you, discounts makes zero sense.
Answering your question, yes, i did quite extensive experiments with discounts on and off in ~18 months period. I found that discounts don't bring more income for me and therefore i decided to permanently quit all discounting programs. I left an option for buyers to negotiate lower price if they really want this, but surprisingly very few people actually use that option. I have no issues with sales, or with income most of the time and i didn't notice that people would purchase less of my models when there's an active discount events going on. I guess that when customers realise, that you are not participating in discount program, there's no need for them to wait for special time and they are buying your models whenever they need them.