I'd argue even a +10 RoS isn't strictly better, by considering the alternatives. For the boots, not counting the artifact boots, the 2nd best choices would be either FA or Stability. FA's not that hard to find, and nexus resist is nice, but not critical. For the rings, you've got poison resistance, bodykeeping, soulkeeping, stat boosting, and damage...all of which can be very attractive. To be sure: the RoS would trump these, considered in isolation, but if you have a 3rd speed boosting item you'll use anyway, you may have enough speed with only 2 of the 3 items. In that scenario, the ring alternatives may give considerably more.
I also agree that 48K is much too low. Now...part of this may be the store-related issues...high Char giving too much of a discount, coupled with a favorable storekeeper/@ race interaction. Flat percentage adjustments break down when you start talking very high-ticket items like this.
Still...at most, this is maybe 20%? So the baseline price would be more like 65K or so, perhaps. Well...that's a little more reasonable, as that's the combined cost of a very nice weapon (e.g. HA katana) and very nice armor. But, given that +6 speed is a compelling mid-game quality, and +9 end-game quality, the price structure should reflect this. Perhaps this means something like 400K for the +9 boots, and 150-200K for the +6 boots...so a general form might be 2^(b/3) * 50,000, where b is the bonus. Or 2^(b/2) * 25,000...+1 would be 35,000 or so, +10 would be 800,000.
Another option is something other than a completely simple die roll for the bonus. Something like a normal distribution, especially where the mean of the distribution is affected by the generation level. We can probably let +2 or +3 boots show up occasionally in the armor shop, or on an early dungeon level. And conversely, we don't want to see +2 boots on DL 80. A hypothetical normal distribution for speed might be (doing everything in floating point math til the end):
mean == 1 + DL/20
std dev == DL / 100
I also agree that 48K is much too low. Now...part of this may be the store-related issues...high Char giving too much of a discount, coupled with a favorable storekeeper/@ race interaction. Flat percentage adjustments break down when you start talking very high-ticket items like this.
Still...at most, this is maybe 20%? So the baseline price would be more like 65K or so, perhaps. Well...that's a little more reasonable, as that's the combined cost of a very nice weapon (e.g. HA katana) and very nice armor. But, given that +6 speed is a compelling mid-game quality, and +9 end-game quality, the price structure should reflect this. Perhaps this means something like 400K for the +9 boots, and 150-200K for the +6 boots...so a general form might be 2^(b/3) * 50,000, where b is the bonus. Or 2^(b/2) * 25,000...+1 would be 35,000 or so, +10 would be 800,000.
Another option is something other than a completely simple die roll for the bonus. Something like a normal distribution, especially where the mean of the distribution is affected by the generation level. We can probably let +2 or +3 boots show up occasionally in the armor shop, or on an early dungeon level. And conversely, we don't want to see +2 boots on DL 80. A hypothetical normal distribution for speed might be (doing everything in floating point math til the end):
mean == 1 + DL/20
std dev == DL / 100
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