Kyoto Showcase, Taxes, and Bamboo Coins

Agreed. I cannot buy anything else with my seasonal coins, all I can do is exchange them for bamboo coins - and I'm running out of things to buy with those too. Once I complete the city album, there's another 182,000 bamboo coins to collect with nothing to spend them on. 

I've said before, seasonal currency should roll over to the next season. I have no problem with the specific bamboo coins expiring but each season uses seasonal currency. Why let it expire? Or, if regular players have been lucky enough to accrue a sizeable amount of seasonal currency with nothing else to spend it on, allow them to spend it on other valuable items like rail cards, or in the ludicrously-priced 'curated showcase'?