Hello. I'm not a dev, so really this is nothing to do with me, but the only comment I'd make, is the site is essentially promoting discounting, which in the long run is bad for everyone.
.All devs will do discounts and bundle deals from time to time, but you need to be careful how obvious and "in your face" you make it, otherwise, before long, no one buys at full price, instead monitoring sites like this and either only buying discounted apps (again, bad in the long run for everyone), or waiting until the app they want is discounted before buying. The normal end game is people giving up, going bust, or both.
I've seen this happen in quite a few sectors now, it's a real world risk. When Google Shopping came along it was great, now it's a race to the bottom, with only the cheapest winning.