1. Toasters generate heat, and Bitcoin mining needs cold temperatures to operate at optimum power. {Toasters will therefore be a bad application for mining}
2. If you plan on mining only when you make toast, you will have to buy a warehouse for all that toast to show a profit.
3. It would be better to use the toaster to warm up the bread with the heat generated from the mining, before you toast it... It's not going to be hot enough to toast it.
4. Will there be place for the toast, when you add all the ASIC's for the mining?
Just a thought... Play with it.
"If I wasn't so isolated, I would instruct you to disconnect the heating elements and mine away while flippin' the levers during gaming sessions."