any standardized style of reporting is fine imo, the resulting take rate will just be lower if you choose to standardize on a higher volume
last i checked, kalshi's fee structure is nonlinear, though. the take rate on 1% likelihood mkt traded < take rate on a 50/50 mkt trading, which tbh seems pretty good.
re: selling a 1c position for 2c and reporting $1 volume both times, i think its also probably okay. when you sold for 2c, you're charged the fee as if you bought for 98c (both sides pay the same fee rate iirc bc they use a factor of 1-likelihood in the fee rate calc)
yes this all makes casino reporting and exchange reporting harder to compare but thats okay - theyre not the same and we can do the analysis / math lol
not sure how fee rebates are/will be documented for calculating final take rates but this is again the case for most exchanges
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