if you are making rims for "RWD Drift style Corolla's", I'm assuming you are talking about the AE86. If so, you won't get many people who go over 15 inch. Speaking as a corolla owner, I'm peticularly looking for a 15 x 7 with a very low offset (0 - -6 or so).
Plus, +12 wheels to +35 are more suited to 240sx's. Corollas run +20 I think stock and they are so far into the wheel well. My last set of rims were 14 x 7 +8 and they were close to the fender.
I guess what i'm trying to say is you won't sell very many in that size range, mainly because corollas make so little power, they could barely turn a 17 inch rim