I partially agree with you. I agree on that XCP and BTC are bad units of accounts. I'll also add that Counterparty is a platform where anyone can issue / invent a better currency, e.g. a trustworthy company can issue a counterparty-asset backed by the dollar. Then it's up to the free market (i.e. users of counterparty) to decide on their preferred choice of currency. At the moment XCP and BTC are the least worst, hence chosen by the market.

The problem with "inverse" prices, however, is merely a psychological one. In real life we buy a Snickers bar for price $2 at the supermarket, right? It's equally to correct to say that we sell dollars for price 0.5 Snicker at the supermarket... Next time you enter a store, tell the clerk you have some dollars you want to sell

In the Counterwallet I suggest just that when XCP or BTC are part of a trade, these will be assumed as currency (no change needed in Counterparty itself). There might be some more elegant way of dealing with the problem. E.g. by counting how many different token each token has been traded against. The higher count, the more likely it is to be the "currency".