Could you imagine if eBay or any other online market was implemented this way? You can only view a randomly selected set of items and when you find an item you want, it's already sold. That's not laws of supply and demand, that's just a poor implementation of a market place.
Instead of a item-specific search, consider a compromise that allows a filter based on product type (Vu items, Land Expansion, Storage Expansion, Hardware items, Building Supply items, etc...)? For instance once you max out storage (if you were lucky enough to do this early), then you no longer care to search for them.
At one time the GTHQ was much better at mutual exclusive access of items that are displayed to a given user. This seems to have regressed significantly.
It would be nice if you could refresh from within the GTHQ or show more products at one time. The small windows of items you get to see at a time is very limiting since it is missing filtering capabilities.
I was hoping that there would be improvements to the GTHQ that we have all been asking for but I'm not holding my breath after seeing this post. In fact this post was the complete opposite I wanted to see; justifying the current implementation as by design.