The current setup's goal seems to be an attempt to force cav players to not use coursers or arabian cavalry shits on a regular basis. Instead, those horses, being extremely fast and awesome, are supposed to be taken out of the stables less frequently than are the rouncey's and desert horses and palfreys.
Grind on the shitty horses, get money, then spend it on good horses.
I just find the entire idea of balancing an item through the manipulation of its expense (and thus, really, the amount of time a player may actually use it) to be distasteful. It's rather much of a buzzkill to purchase a really cool item, only to be unable to use until hearty sums of gold have been earned--again.
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I must also point out that cav isn't quite as overpowered as some might say it is. It is true that, on the right map, you may occasionally get hordes of cavalrymen kicking everyone's asses, but the form of "OP" that cav takes is merely different from the form of OP that, say, Goretooth takes when he's on a killing rampage.
The reason for this OPness is the very nature of the cRPG, and of those who play it. The game is unorganized, largely, and most teams consist of gaggle-fucks, which are themselves composed of egocentric player's whose goals range from "get kills" to "fight shit" to "stay alife". Cavalry players prey on the disorganized, the poorly equipped, the stragglers, and on those who have separated from their battle buddies. It follows that the greatest counter to cavalry are organization and awareness.
That point, however, is somewhat moot, for asking pubbers to organize themselves into even a slightly more organized gaggle-fuck formation than they would usually utilize is asking too much. Sometimes we see anti-cav organization--often after one or two rounds of hearty rape, but that is the exception rather than the norm. On a more practical level, cavalry can often be defeated by one or two players who, using the right weapons, take it upon themselves to focus on that particular task. These players will not rack up many kills, for their targets are horses, not the riders, who often carry shields or hold the down-block button constantly. These players will not get to enjoy the lulz of infantry combat, but instead will hang out on the flanks or rear of a gaggle-fuck with a pike, killing kill-hungry cavalry; or they will stand inside the safety of the gaggle-fuck and pump arrows into passing horses, in the process missing out on the chance to shoot some faces.
tl;dr: im bored and ima go play cRPG now.