I don't, but I don't see how mining Monero is different than mining any other coin.
Just answer yourself this question - Am I mining for dollars or am I mining for coins?
If you're mining for dollars - you should mine whatever coin brings the most $ per day profit and you should sell the coin every time you pass the payment threshold.
If you're mining for coins - you're essentially investing in the coin for X price (which is usually below the CURRENT market price). You're also utilizing a dollar-cost averaging investment strategy (Google it).
Now if you're mining for coins, you should do your research and decide which coin you should mine (read - buy), because you're essentially betting that the price of this coin will raise and sooner or later, you will sell for (more) dollars.
Also, mining should be considered a mid-term investment. Even though with current prices your equipment will pay for itself in the next 6-9 months (if mining for dollars), you should probably be mining for 1-3 years.
If you're not familiar with cryptocurrencies and investing in general, the safer approach would be to mine for dollars.
If you think you can find a coin, which is undervalued and that in 1-3 years it'll cost more than it costs today (or at least the same amount), you should be mining for coins. Keep in mind that when mining, accumulation of coins happens overtime which might cause you to miss an economic/price/trade cycle. If you've a more short-term/trading/gambling approach to cryptocurrencies, you might be better of directly buying the coin and holding until you decide the moment is right to sell.