Well..... you are twisting this a bit. It used to be that demand drove ticket prices much more. Yes, weekend games, Cubs, etc. were more. And rightly so. However, the difference is that some games are being moved up in price that do not have much demand. Some Thursday games or Friday games are being yanked up since the offer is half price seats (First Fridayday and Kids/Senior Days). They used to never do that. It's hardly a deal now.
Also, the Flash deals were mentioned before too... if the attendance is low, and it must be for early week April games against Tampa, the prices are slashed. Now applauding goes to the Brewers for that, but maybe it is because the price point was too high in the first place.
If you want to go deeper with this, take a look at Group Tickets. No longer is there tiers for group dates (well, two groupings, I guess). It is basically a flat 20% off rate for certain dates and the others you are paying premium prices. I used to do a group or two every year. Some seats in the Loge were $10-$15 on certain days without many fans (Super Saver). Now, the 20% off just isn't worth it to organize and risk getting rid of them or simply getting paid. Regardless of your view of this, the price is very DIFFERENT. It's different with the website pricing, and it is different with the group tickets too. That is fact.
And yes, many fans are learning that it doesn't pay to buy jacked up tickets in advance. They are going less and scoffing at the prices being asked. Throwing these flash deals will drive that point home to fans. Just wait for the deal (or simply watch on tv).