I think the game designers need to install a feature to purchase Cafeland Cash with Cafeland gold. It is nearly impossible to save up enough Cafeland Cash for the last two expansions without having to actually purchase Cafeland Cash with real world currency which most people are unwilling to do. Even an exchange rate of 1,000,000 Cafeland Gold for 1 Cafeland Cash would be reasonable enough. PLEASE do not turn this into one of those games where you HAVE to purchase things (especially currency) with real currency. It's a waste of people's hard earned money and no better than gambling.
I have asked the same question, then we can buy more decorations too.