Long known (and memed) about, but the 10 Rupee entrance fee could be a problem if behind that entrance is a shop or Business Scrub that requires a full Wallet with no way to farm Rupees. Neither logic nor the ER fill algorithm currently accounts for this. The easiest solutions are likely to either remove the entrance fee (optionally depending on ER settings), or to make opening GTG a permanent flag (optionally depending on ER settings).