You're probably going to lose more money in the long term due to your laptop's hardware degrading a lot faster. Not to mention your laptop is going to sound like a F-22 Raptor aircraft.
This reply pretty much summed it up:
TLDR; miners are big, loud, noisy and energy hungry. If you show up somewhere and just plug one in casually, Homeland Security will probably add you to their list.
I think it sounds totally realistic.
There you are at Starbucks, just reading your book, drinking your latte, and mining away on your SP31.
Sure, you had to run two extension cords to get enough power from two separate outlets. (You had to try a few outlets before you found two on separate breakers, but now you're mining!)
People walk by and say stuff like "Nice computer!" and "No crazy guy would be running some sort of massive, noisy, loud computer in this small cafe. No, that's perfectly sane behaviour."
Sure, they can't foam anyone's milk or use the microwave without tripping the main breaker on the 60 amp panel that powers the cafe, but they don't understand how rich you'll be, so long as they keep letting you show up from 9-5, 7 days a week to mine. The $13/day (well, maybe $7 a day, since they aren't open 24/7) you make from your $2000 piece of equipment will pay off in no time, so long as you include the coffee they make you buy before they kick you out.