I don’t think we should be too quick to presume how the economy is gonna look after launch, based on a level capped beta.
A few things make the beta experience skewed compared to what we might see in 1 or 2 months.
1 - number of players is likely considerably lower than release, despite being a shared global server
2 - everyone was kept from progressing, and thus stagnated at a point where a few single scarce materials were in exceedingly high demand for BoP crafts, Pristine Leather in particular
3 - if you take a look at the later BoP recipes, they start requiring more stuff, both dropped, gathered and crafted, so there won’t be a single thing for the bots to focus on, due to the diversity of demand that we’ll be seeing lategame
4 - Blizz has already shown that they’re ready to strike down hard on both bots, and the people they sell their gold to. As this becomes more prevalent, the reward for botting will go down, and we’ll naturally see fewer and fewer of them (that’s the hope at least)
Is it gonna be perfect? Probably not, but it never was. Bots always had something they could target farm, whether it was black lotus, black dragon scales, water motes in the lake outside Shattrath, or whatever else. Pick your expansion, and there was something in constant enough demand that automating a farm for it was profitable. Gold sellers have never bothered buying out the market and dictating a high price, because they rely on volume alone to carry their throughput.
The people actually attempting to control a market and drive up prices, are players who enjoy playing the auction house, and since we’re moving to one giant EU server for each ruleset, the sheer amount of stuff posted will drastically increase, meaning it will be immensely more difficult to ever actually empty and control a given market.