What are your thoughts /experiences mining not just BTC but other coins and moving in/out a percentage of each with obvious price fluctuations upwards?

Seems logical to mine certain alt coins and trade them to BTC during jumps.
The mathmatecal consideration would be cost to mine BTC during a period and the comparable cost for an alt coin that can be converted to BTC etc.

I plan to start mining with a test pair of S7 soon and hope nextgen 16nm releases will be made available post learning curve to really dive in.

Any experiences sharing is appreciated and valued.
BTW I'm a reasonable fella and know this is a financial risk (so is fiat money) so no need to "overly warn" me.

Regards