Fluctuating member valuation

I entered a valuation in UKP £ and noticed a few days later that the valuations changed. Eg £5 entered as a valuation now shows £4.98!

I presume you convert the valuation to dollars, and convert back using current exchange rate. This works ok for HipValues but doesn't make any sense for member valuations.

Please store the member valuation in its native currency so the valuation made doesn't fluctuate with the exchange rate.