The Frankfurt Exchange is similar to the OTB in that it has tiers. For Ticker to get on the next tier they need to provide audited financials. As I said that takes time and money...and is in the works.
The secret to profitable investing is to buy into well-run companies at the beginning of their earnings growth cycle—before Wall Street takes notice and bids up the stock price. My opinions are my own. You have to decide and do what's best for you.